diff --git a/hack/update-codecgen.sh b/hack/update-codecgen.sh
index 63f1fa50cce..1bf2a268d02 100755
--- a/hack/update-codecgen.sh
+++ b/hack/update-codecgen.sh
@@ -48,6 +48,8 @@ for (( i=0; i<number; i++ )); do
 done
 result=""
 
+# NOTE: depends function assumes that the whole repository is under
+# */k8s.io/kubernetes directory - it will NOT work if that is not true.
 function depends {
   file=${generated_files[$1]//\.generated\.go/.go}
   deps=$(go list -f "{{.Deps}}" ${file} | tr "[" " " | tr "]" " ")