diff --git a/docs/how-to-create-new-effects.md b/docs/how-to-create-new-effects.md
index 0d10d04..730c131 100644
--- a/docs/how-to-create-new-effects.md
+++ b/docs/how-to-create-new-effects.md
@@ -152,10 +152,11 @@ var SimpleFade = class SimpleFade {
 
   // This is also called from extension.js. It is used to tweak a window's open / close
   // transitions - usually windows are faded in / out and scaled up / down by GNOME Shell.
-  // forOpening is set to true if this is called for a window-open transition, for a
-  // window-close transition it is set to false. The modes can be set to any value from
-  // here: https://gjs-docs.gnome.org/clutter8~8_api/clutter.animationmode. This also
-  // determines how the uProgress uniform value will progress in the shader.
+  // The parameter 'forOpening' is set to true if this is called for a window-open
+  // transition, for a window-close transition it is set to false. The modes can be set to
+  // any value from here: https://gjs-docs.gnome.org/clutter8~8_api/clutter.animationmode.
+  // This also determines how the uProgress uniform value will progress in the shader.
+  // Tweaking the actor's scale during the transition only works properly for GNOME 3.38+.
   // For this effect, windows should neither be scaled nor faded.
   static tweakTransition(actor, settings, forOpening) {
     return {
diff --git a/extension.js b/extension.js
index fd393f2..5115b3e 100644
--- a/extension.js
+++ b/extension.js
@@ -100,22 +100,26 @@ class Extension {
         realWindow = params[0].get_compositor_private();
       }
 
-      const xID = realWindow.connect('notify::scale-x', () => {
-        if (realWindow.scale_x > 0) {
-          clone.scale_x = realWindow.scale_x;
-        }
-      });
+      // Syncing the real window's scale with the scale of its clone only works on GNOME
+      // Shell 3.38+. So effects cannot scale windows in the overview of GNOME 3.36...
+      if (utils.shellVersionIsAtLeast(3, 38)) {
+        const xID = realWindow.connect('notify::scale-x', () => {
+          if (realWindow.scale_x > 0) {
+            clone.scale_x = realWindow.scale_x;
+          }
+        });
 
-      const yID = realWindow.connect('notify::scale-y', () => {
-        if (realWindow.scale_y > 0) {
-          clone.scale_y = realWindow.scale_y;
-        }
-      });
+        const yID = realWindow.connect('notify::scale-y', () => {
+          if (realWindow.scale_y > 0) {
+            clone.scale_y = realWindow.scale_y;
+          }
+        });
 
-      clone.connect('destroy', () => {
-        realWindow.disconnect(xID);
-        realWindow.disconnect(yID);
-      });
+        clone.connect('destroy', () => {
+          realWindow.disconnect(xID);
+          realWindow.disconnect(yID);
+        });
+      }
 
       // On GNOME 3.36, the window clone's 'destroy' handler only calls _removeWindowClone
       // but not _doRemoveWindow. The latter is required to trigger the repositioning of
@@ -155,9 +159,8 @@ class Extension {
 
 
 
-    // This class is only available in GNOME Shell 3.38+. So no transition tweaking in
-    // GNOME Shell 3.36, but this is not used by any effect available there anyways for
-    // now...
+    // This class is only available in GNOME Shell 3.38+. So no overlay-hiding on
+    // GNOME Shell 3.36 for now.
     if (WindowPreview) {
       this._origDeleteAll = WindowPreview.prototype._deleteAll;
       this._origRestack   = WindowPreview.prototype._restack;