diff --git a/app/src/main/java/eu/faircode/email/ActivityView.java b/app/src/main/java/eu/faircode/email/ActivityView.java
index bf302f0531..95bdf607e1 100644
--- a/app/src/main/java/eu/faircode/email/ActivityView.java
+++ b/app/src/main/java/eu/faircode/email/ActivityView.java
@@ -126,6 +126,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
     static final String ACTION_STORE_ATTACHMENT = BuildConfig.APPLICATION_ID + ".STORE_ATTACHMENT";
     static final String ACTION_DECRYPT = BuildConfig.APPLICATION_ID + ".DECRYPT";
     static final String ACTION_SHOW_PRO = BuildConfig.APPLICATION_ID + ".SHOW_PRO";
+    static final String ACTION_SHOW_LEGEND = BuildConfig.APPLICATION_ID + ".SHOW_LEGEND";
 
     static final String UPDATE_LATEST_API = "https://api.github.com/repos/M66B/open-source-email/releases/latest";
     static final long UPDATE_INTERVAL = 12 * 3600 * 1000L; // milliseconds
@@ -350,6 +351,7 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         iff.addAction(ACTION_STORE_ATTACHMENT);
         iff.addAction(ACTION_DECRYPT);
         iff.addAction(ACTION_SHOW_PRO);
+        iff.addAction(ACTION_SHOW_LEGEND);
         lbm.registerReceiver(receiver, iff);
 
         if (!pgpService.isBound())
@@ -1060,6 +1062,8 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
                 onDecrypt(intent);
             else if (ACTION_SHOW_PRO.equals(intent.getAction()))
                 onShowPro(intent);
+            else if (ACTION_SHOW_LEGEND.equals(intent.getAction()))
+                onMenuLegend();
         }
     };
 
diff --git a/app/src/main/java/eu/faircode/email/AdapterFolder.java b/app/src/main/java/eu/faircode/email/AdapterFolder.java
index 680ea00130..df3728a6a8 100644
--- a/app/src/main/java/eu/faircode/email/AdapterFolder.java
+++ b/app/src/main/java/eu/faircode/email/AdapterFolder.java
@@ -71,6 +71,7 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
         private final static int action_delete_local = 2;
         private final static int action_empty_trash = 3;
         private final static int action_edit_properties = 4;
+        private final static int action_legend = 5;
 
         ViewHolder(View itemView) {
             super(itemView);
@@ -181,99 +182,126 @@ public class AdapterFolder extends RecyclerView.Adapter<AdapterFolder.ViewHolder
             if (folder.account != null)
                 popupMenu.getMenu().add(Menu.NONE, action_edit_properties, 4, R.string.title_edit_properties);
 
+            popupMenu.getMenu().add(Menu.NONE, action_legend, 5, R.string.menu_legend);
+
             popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
                 @Override
                 public boolean onMenuItemClick(MenuItem target) {
-                    LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
                     switch (target.getItemId()) {
                         case action_synchronize_now:
-                            Log.i(Helper.TAG, folder.name + " requesting sync");
-                            lbm.sendBroadcast(
-                                    new Intent(ServiceSynchronize.ACTION_SYNCHRONIZE_FOLDER)
-                                            .setType("account/" + (folder.account == null ? "outbox" : Long.toString(folder.account)))
-                                            .putExtra("folder", folder.id));
+                            onActionSynchronizeNow();
                             break;
 
                         case action_delete_local:
-                            Bundle args = new Bundle();
-                            args.putLong("id", folder.id);
-                            args.putBoolean("outbox", folder.account == null);
-
-                            new SimpleTask<Void>() {
-                                @Override
-                                protected Void onLoad(Context context, Bundle args) {
-                                    long id = args.getLong("id");
-                                    boolean outbox = args.getBoolean("outbox");
-                                    Log.i(Helper.TAG, "Delete local messages outbox=" + outbox);
-                                    if (outbox)
-                                        DB.getInstance(context).message().deleteSeenMessages(id);
-                                    else
-                                        DB.getInstance(context).message().deleteLocalMessages(id);
-                                    return null;
-                                }
-
-                                @Override
-                                public void onException(Bundle args, Throwable ex) {
-                                    Helper.unexpectedError(context, ex);
-                                }
-                            }.load(context, owner, args);
-
+                            OnActionDeleteLocal();
                             break;
 
                         case action_empty_trash:
-                            new DialogBuilderLifecycle(context, owner)
-                                    .setMessage(R.string.title_empty_trash_ask)
-                                    .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
-                                        @Override
-                                        public void onClick(DialogInterface dialog, int which) {
-
-                                            Bundle args = new Bundle();
-                                            args.putLong("id", folder.id);
-
-                                            new SimpleTask<Void>() {
-                                                @Override
-                                                protected Void onLoad(Context context, Bundle args) {
-                                                    long id = args.getLong("id");
-
-                                                    DB db = DB.getInstance(context);
-                                                    try {
-                                                        db.beginTransaction();
-
-                                                        for (Long mid : db.message().getMessageByFolder(id)) {
-                                                            EntityMessage message = db.message().getMessage(mid);
-                                                            db.message().setMessageUiHide(message.id, true);
-                                                            EntityOperation.queue(db, message, EntityOperation.DELETE);
-                                                        }
-
-                                                        db.setTransactionSuccessful();
-                                                    } finally {
-                                                        db.endTransaction();
-                                                    }
-
-                                                    EntityOperation.process(context);
-
-                                                    return null;
-                                                }
-
-                                                @Override
-                                                protected void onException(Bundle args, Throwable ex) {
-                                                    Helper.unexpectedError(context, ex);
-                                                }
-                                            }.load(context, owner, args);
-                                        }
-                                    })
-                                    .setNegativeButton(android.R.string.cancel, null)
-                                    .show();
+                            onActionEmptyTrash();
                             break;
 
                         case action_edit_properties:
-                            lbm.sendBroadcast(
-                                    new Intent(ActivityView.ACTION_EDIT_FOLDER)
-                                            .putExtra("id", folder.id));
+                            onActionEditProperties();
+                            break;
+
+                        case action_legend:
+                            onActionLegend();
                             break;
                     }
                     return true;
                 }
+
+                private void onActionSynchronizeNow() {
+                    Log.i(Helper.TAG, folder.name + " requesting sync");
+                    LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+                    lbm.sendBroadcast(
+                            new Intent(ServiceSynchronize.ACTION_SYNCHRONIZE_FOLDER)
+                                    .setType("account/" + (folder.account == null ? "outbox" : Long.toString(folder.account)))
+                                    .putExtra("folder", folder.id));
+                }
+
+                private void OnActionDeleteLocal() {
+                    Bundle args = new Bundle();
+                    args.putLong("id", folder.id);
+                    args.putBoolean("outbox", folder.account == null);
+
+                    new SimpleTask<Void>() {
+                        @Override
+                        protected Void onLoad(Context context, Bundle args) {
+                            long id = args.getLong("id");
+                            boolean outbox = args.getBoolean("outbox");
+                            Log.i(Helper.TAG, "Delete local messages outbox=" + outbox);
+                            if (outbox)
+                                DB.getInstance(context).message().deleteSeenMessages(id);
+                            else
+                                DB.getInstance(context).message().deleteLocalMessages(id);
+                            return null;
+                        }
+
+                        @Override
+                        public void onException(Bundle args, Throwable ex) {
+                            Helper.unexpectedError(context, ex);
+                        }
+                    }.load(context, owner, args);
+                }
+
+                private void onActionEmptyTrash() {
+                    new DialogBuilderLifecycle(context, owner)
+                            .setMessage(R.string.title_empty_trash_ask)
+                            .setPositiveButton(android.R.string.ok, new DialogInterface.OnClickListener() {
+                                @Override
+                                public void onClick(DialogInterface dialog, int which) {
+
+                                    Bundle args = new Bundle();
+                                    args.putLong("id", folder.id);
+
+                                    new SimpleTask<Void>() {
+                                        @Override
+                                        protected Void onLoad(Context context, Bundle args) {
+                                            long id = args.getLong("id");
+
+                                            DB db = DB.getInstance(context);
+                                            try {
+                                                db.beginTransaction();
+
+                                                for (Long mid : db.message().getMessageByFolder(id)) {
+                                                    EntityMessage message = db.message().getMessage(mid);
+                                                    db.message().setMessageUiHide(message.id, true);
+                                                    EntityOperation.queue(db, message, EntityOperation.DELETE);
+                                                }
+
+                                                db.setTransactionSuccessful();
+                                            } finally {
+                                                db.endTransaction();
+                                            }
+
+                                            EntityOperation.process(context);
+
+                                            return null;
+                                        }
+
+                                        @Override
+                                        protected void onException(Bundle args, Throwable ex) {
+                                            Helper.unexpectedError(context, ex);
+                                        }
+                                    }.load(context, owner, args);
+                                }
+                            })
+                            .setNegativeButton(android.R.string.cancel, null)
+                            .show();
+                }
+
+                private void onActionEditProperties() {
+                    LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+                    lbm.sendBroadcast(
+                            new Intent(ActivityView.ACTION_EDIT_FOLDER)
+                                    .putExtra("id", folder.id));
+                }
+
+                private void onActionLegend() {
+                    LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(context);
+                    lbm.sendBroadcast(new Intent(ActivityView.ACTION_SHOW_LEGEND));
+                }
             });
 
             popupMenu.show();
diff --git a/app/src/main/res/layout/fragment_legend.xml b/app/src/main/res/layout/fragment_legend.xml
index 0097660043..0c425e892a 100644
--- a/app/src/main/res/layout/fragment_legend.xml
+++ b/app/src/main/res/layout/fragment_legend.xml
@@ -388,5 +388,77 @@
             app:layout_constraintStart_toEndOf="@id/ivClosing"
             app:layout_constraintTop_toTopOf="@id/ivClosing" />
 
+        <TextView
+            android:id="@+id/tvSyncKeep"
+            android:layout_width="wrap_content"
+            android:layout_height="0dp"
+            android:layout_marginTop="24dp"
+            android:gravity="center_vertical"
+            android:text="123/456"
+            android:textAppearance="@android:style/TextAppearance.Small"
+            app:layout_constraintBottom_toBottomOf="@+id/tvSyncKeepLegend"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/tvClosing" />
+
+        <ImageView
+            android:id="@+id/ivSyncKeep"
+            android:layout_width="24dp"
+            android:layout_height="0dp"
+            android:layout_marginStart="6dp"
+            android:src="@drawable/baseline_mail_outline_24"
+            app:layout_constraintBottom_toBottomOf="@+id/tvSyncKeepLegend"
+            app:layout_constraintStart_toEndOf="@id/tvSyncKeep"
+            app:layout_constraintTop_toTopOf="@id/tvSyncKeep" />
+
+        <TextView
+            android:id="@+id/tvSyncKeepLegend"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="18dp"
+            android:text="@string/title_legend_sync_keep"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@id/ivSyncKeep"
+            app:layout_constraintTop_toTopOf="@id/ivSyncKeep" />
+
+        <androidx.constraintlayout.widget.Barrier
+            android:id="@+id/barrierSyncKeep"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            app:barrierDirection="bottom"
+            app:constraint_referenced_ids="tvSyncKeep,ivSyncKeep,tvSyncKeepLegend" />
+
+        <TextView
+            android:id="@+id/tvDownloadFetch"
+            android:layout_width="wrap_content"
+            android:layout_height="0dp"
+            android:layout_marginTop="12dp"
+            android:gravity="center_vertical"
+            android:text="123/456"
+            android:textAppearance="@android:style/TextAppearance.Small"
+            app:layout_constraintBottom_toBottomOf="@+id/tvDownloadLegend"
+            app:layout_constraintStart_toStartOf="parent"
+            app:layout_constraintTop_toBottomOf="@id/barrierSyncKeep" />
+
+        <ImageView
+            android:id="@+id/ivDownloadFetch"
+            android:layout_width="24dp"
+            android:layout_height="0dp"
+            android:layout_marginStart="6dp"
+            android:src="@drawable/baseline_sync_24"
+            app:layout_constraintBottom_toBottomOf="@+id/tvDownloadLegend"
+            app:layout_constraintStart_toEndOf="@id/tvDownloadFetch"
+            app:layout_constraintTop_toTopOf="@id/tvDownloadFetch" />
+
+        <TextView
+            android:id="@+id/tvDownloadLegend"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_marginStart="18dp"
+            android:text="@string/title_legend_download_fetch"
+            android:textAppearance="@style/TextAppearance.AppCompat.Medium"
+            app:layout_constraintEnd_toEndOf="parent"
+            app:layout_constraintStart_toEndOf="@id/ivDownloadFetch"
+            app:layout_constraintTop_toTopOf="@id/ivDownloadFetch" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 </ScrollView>
\ No newline at end of file
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index d04f74bb67..8083beb89a 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -313,6 +313,8 @@
     <string name="title_legend_synchronizing">Synchronizing</string>
     <string name="title_legend_downloading">Downloading</string>
     <string name="title_legend_closing">Closing</string>
+    <string name="title_legend_sync_keep">Number of days to synchronize / to keep messages</string>
+    <string name="title_legend_download_fetch">Number of message bodies downloaded / headers fetched</string>
 
     <string name="title_hint_folder_actions">Long press for options</string>
     <string name="title_hint_support">If you have a question or a problem, please use the support menu to get help</string>