diff --git a/XCODE_6_UPGRADES_TODO.txt b/XCODE_6_UPGRADES_TODO.txt
index cbc26b39e529b533eb8da15b47470bf17d57caed..0802f1977f3b0ca75c5d945cb97f6dded4baa85d 100644
--- a/XCODE_6_UPGRADES_TODO.txt
+++ b/XCODE_6_UPGRADES_TODO.txt
@@ -15,4 +15,6 @@
 	* remove unused variables 78-81
 	* remove pointer to hacked version in vewer autobuild.xml
 
+* clang demands default ctor here: https://bitbucket.org/callum_linden/viewer-tools-update-callum/src/c58560da7bb6e00deffcbbc1c25cbf87bf2e96ec/indra/newview/llgrouplist.cpp?at=default#cl-53   side effects?
+