diff --git a/docs/mac/todo.txt b/docs/mac/todo.txt
index 177182d211..1e6d62469b 100644
--- a/docs/mac/todo.txt
+++ b/docs/mac/todo.txt
@@ -1,4 +1,17 @@
 in the carbon targets the following items are still missing
 
 - printing support
-- navigation services support
\ No newline at end of file
+- navigation services support
+
+Bugs/Defects (GD)
+-----------------
+* Correct listbox creation which is causing the following error message
+  under Mac OS X:
+
+./Controls/Source/ControlAllocation.cp:755: failed assertion `theErr == noErr'
+Abort
+
+  This is due to the constant kwxMacListWithVerticalScrollbar at line 40 of
+  src/mac/listbox.cpp.
+
+* Implement toggle buttons missing under Mac OS & Mac OS X