diff --git a/content/base/src/nsDocument.h b/content/base/src/nsDocument.h
index 72451b449b56..0c6e3c4b08f1 100644
--- a/content/base/src/nsDocument.h
+++ b/content/base/src/nsDocument.h
@@ -106,6 +106,7 @@ public:
 
   /**
    * Get the style sheets owned by this document.
+   * These are ordered, highest priority last
    */
   virtual PRInt32 GetNumberOfStyleSheets();
   virtual nsIStyleSheet* GetStyleSheetAt(PRInt32 aIndex);
diff --git a/layout/base/src/nsDocument.h b/layout/base/src/nsDocument.h
index 72451b449b56..0c6e3c4b08f1 100644
--- a/layout/base/src/nsDocument.h
+++ b/layout/base/src/nsDocument.h
@@ -106,6 +106,7 @@ public:
 
   /**
    * Get the style sheets owned by this document.
+   * These are ordered, highest priority last
    */
   virtual PRInt32 GetNumberOfStyleSheets();
   virtual nsIStyleSheet* GetStyleSheetAt(PRInt32 aIndex);