diff --git a/cli/transmission-cli.1 b/cli/transmission-cli.1
index d91c2dfe7..2fdcfc3b5 100644
--- a/cli/transmission-cli.1
+++ b/cli/transmission-cli.1
@@ -96,7 +96,7 @@ a SIGHUP signal will contact the tracker for more peers.
 .It Ev TRANSMISSION_HOME
 Sets the default config-dir.
 .It Ev http_proxy
-Sets the proxy to use for http tracker announces.
+libcurl uses this environment variable when performing tracker announces.
 .El
 .Sh FILES
 .Bl -tag -width Ds -compact
diff --git a/daemon/transmission-daemon.1 b/daemon/transmission-daemon.1
index 0324d2d41..c039a238d 100644
--- a/daemon/transmission-daemon.1
+++ b/daemon/transmission-daemon.1
@@ -128,7 +128,7 @@ Show error, info, and debug messages
 .Sh ENVIRONMENT
 .Bl -tag -width Fl
 .It Ev http_proxy
-Sets the proxy to use for http tracker announces.
+libcurl uses this environment variable when performing tracker announces.
 .It Ev TRANSMISSION_HOME
 Sets the default config-dir.
 .El
diff --git a/gtk/transmission-gtk.1 b/gtk/transmission-gtk.1
index 7b26b6247..e85ca30ce 100644
--- a/gtk/transmission-gtk.1
+++ b/gtk/transmission-gtk.1
@@ -62,7 +62,7 @@ is already running, the torrents will be added to the running instance.
 .It Ev TRANSMISSION_HOME
 Sets the default config-dir.
 .It Ev http_proxy
-Sets the proxy to use for http tracker announces. If set, this overrides the GNOME proxy preferences.
+libcurl uses this environment variable when performing tracker announces.  If set, this overrides the GNOME proxy preferences.
 .El
 .Sh FILES
 .Bl -tag -width Ds -compact