diff --git a/src/libsync/theme.h b/src/libsync/theme.h
index 3496a65667..c9df014530 100644
--- a/src/libsync/theme.h
+++ b/src/libsync/theme.h
@@ -237,6 +237,11 @@ public:
     virtual bool linkSharing() const;
     virtual bool userGroupSharing() const;
 
+    /**
+     * If this returns true, the user cannot configure the proxy in the network settings.
+     * The proxy settings will be disabled in the configuration dialog.
+     * Default returns false.
+     */
     virtual bool forceSystemNetworkProxy() const;
 
     /**