diff --git a/oscar/git-pre-commit-hook b/oscar/git-pre-commit-hook
index ae916bf..d52ec00 100755
--- a/oscar/git-pre-commit-hook
+++ b/oscar/git-pre-commit-hook
@@ -6,6 +6,14 @@ else
         against=$(git hash-object -t tree /dev/null)
 fi
 
+# https://stackoverflow.com/a/7292992
+. git-sh-setup  # for die
+if git-diff-index -p -M --cached $against -- \
+| grep '^+' \
+| grep TODO; then
+    die Blocking commit because string TODO detected in patch
+fi
+
 # If you want to allow non-ASCII filenames set this variable to true.
 allownonascii=$(git config --type=bool hooks.allownonascii)