diff --git a/GNUmakefile b/GNUmakefile
old mode 100644
new mode 100755
index 8f32429670..b33a84a257
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -222,5 +222,5 @@ pack-arm-cmake:
 
 ## Local Variables:
 ## mode: outline-minor
-## outline-regexp: "^\\(### @brief\\|## --SECTION--\\|# -\\*- \\)"
+## outline-regexp: "### @brief\\|## --SECTION--"
 ## End: