diff --git a/git/.gitconfig b/git/.gitconfig
index e996e96..a0f5411 100644
--- a/git/.gitconfig
+++ b/git/.gitconfig
@@ -44,4 +44,5 @@
     # instead of opening all files:
     # git reviewone foo.js bar.js
     reviewone = !vim -p +\"tabdo Gdiff $REVIEW_BASE\" +\"let g:gitgutter_diff_base = '$REVIEW_BASE'\"
+	change-commits = "!f() { VAR=$1; OLD=$2; NEW=$3; shift 3; git filter-branch --env-filter \"if [[ \\\"$`echo $VAR`\\\" = '$OLD' ]]; then export $VAR='$NEW'; fi\" $@; }; f"