diff --git a/pages/upgrade-guide/3.0.md b/pages/upgrade-guide/3.0.md
index d763aac..eee8db0 100644
--- a/pages/upgrade-guide/3.0.md
+++ b/pages/upgrade-guide/3.0.md
@@ -159,6 +159,10 @@ These properties were deprecated in jQuery 1.9, as they were only used for the o
 
 https://github.com/jquery/jquery/issues/1908
 
+#### Breaking change: Deprecated `.size()` removed
+
+`.size()` is deprecated as of jQuery 1.8 and removed in jQuery 3.0 in favor of the `.length` property.
+
 #### Breaking change: Undocumented internal methods no longer exposed
 
 Version 3.0 removes several methods from view that were intended to be private and were never documented: