diff --git a/com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/swt/DropdownPopup.java b/com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/swt/DropdownPopup.java
index 7b9dc2f0..2937e9e2 100644
--- a/com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/swt/DropdownPopup.java
+++ b/com.microsoft.copilot.eclipse.ui/src/com/microsoft/copilot/eclipse/ui/swt/DropdownPopup.java
@@ -156,6 +156,9 @@ void open(Point location, List<DropdownItemGroup> groups, String selectedItemId,
     populateGroups(container, groups);
 
     Point contentSize = container.computeSize(SWT.DEFAULT, SWT.DEFAULT);
+    // Keep sizing simple here. If the popup becomes scrollable we reserve
+    // scrollbar width in constrainHeightIfNeeded(), avoiding double-reserving
+    // the width when the scrollbar is detected in both places.
     container.setSize(contentSize);
     scrolledComposite.setMinSize(contentSize);