diff --git a/uncrustify-riot.cfg b/uncrustify-riot.cfg
index d67a512f6f..54e46a5858 100644
--- a/uncrustify-riot.cfg
+++ b/uncrustify-riot.cfg
@@ -1,3 +1,7 @@
+#
+# indentation
+#
+
 indent_with_tabs        = 0                 # 1=indent to level only, 2=indent with tabs
 input_tab_size          = 4                 # original tab size
 output_tab_size         = 4                 # new tab size