diff --git a/defines_extra b/defines_extra
index fb52addc8147aacd4380ab1fcd489de9f6c8df83..efebea56f7b44cb52644382096e4b1d3bc8d45a4 100644
--- a/defines_extra
+++ b/defines_extra
@@ -1,4 +1,4 @@
-#defines for headers
+# defines for headers
 VERSION_H
 HDF5UTIL_H
 ALLVARS_H