diff --git a/Cookbook.md b/Cookbook.md
index d3dd495..59b7b18 100644
--- a/Cookbook.md
+++ b/Cookbook.md
@@ -1,3 +1,11 @@
+* bad code search tool:
+
+```bash
+bcs() { for file in `grep -l $1 $(git ls-tree -r master --name-only)`; do echo $file: ; highlight --force --line-numbers -O xterm256 --stdout $file | grep -C 5 $1 --label=$file | perl -pne s%^--\$%$file:%; done }
+
+bcs Player
+```
+
 * sizes of things in C#:
 ```
 sizeof(Vector2) = 8