diff --git a/FAQ.md b/FAQ.md
index b5373d5a..4894a4de 100644
--- a/FAQ.md
+++ b/FAQ.md
@@ -278,6 +278,12 @@ For a lot of purposes, including network access, Android groups applications on
 Especially system applications often have the same UID, despite having a different package and application name, these are set up like this by the ROM manufacturer at build time.
 These applications can only be allowed/blocked access to the internet as a group.
 
+<a name="FAQ32"></a>
+**(32) Why is the battery/network usage of NetGuard so high?**
+
+This is because Android contributes battery and network usage which is normally contributed to other applications
+to NetGuard in IP filtering mode.
+IP filtering mode is always enabled on Android version before 5.0 and optionally enabled on later Android versions.
 
 <br />
 
diff --git a/README.md b/README.md
index aaf3cda7..42738536 100644
--- a/README.md
+++ b/README.md
@@ -162,6 +162,9 @@ Frequently Asked Questions (FAQ)
 <a name="FAQ31"></a>
 [**(31) Why can some applications be configured as a group only?**](https://github.com/M66B/NetGuard/blob/master/FAQ.md#FAQ31)
 
+<a name="FAQ32"></a>
+[**(32) Why is the battery/network usage of NetGuard so high**](https://github.com/M66B/NetGuard/blob/master/FAQ.md#FAQ32)
+
 Permissions
 -----------