diff --git a/dist/jquery.fancybox.js b/dist/jquery.fancybox.js
index 806b2703..bee1af29 100644
--- a/dist/jquery.fancybox.js
+++ b/dist/jquery.fancybox.js
@@ -153,6 +153,7 @@
     animationDuration: 366,
 
     // Should image change opacity while zooming
+    // Can be true, false, "auto"
     // If opacity is "auto", then opacity will be changed if image and thumbnail have different aspect ratios
     zoomOpacity: "auto",
 
@@ -5629,4 +5630,4 @@
       });
     }
   });
-})(document, jQuery);
\ No newline at end of file
+})(document, jQuery);