diff --git a/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.java b/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.java
index 00126bd94..523eae093 100644
--- a/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.java
+++ b/core/src/main/java/org/kiwix/kiwixmobile/core/main/CoreReaderFragment.java
@@ -975,7 +975,7 @@ public abstract class CoreReaderFragment extends BaseFragment
   }
 
   @Override public void onFullscreenVideoToggled(@NotNull Boolean isFullScreen) {
-
+    // does nothing because custom doesn't have a nav bar
   }
 
   protected void openFullScreen() {