diff --git a/src/tools/make_ctags b/src/tools/make_ctags
index 37ac134aa3dff87df821e256c4fe1314668c2f99..1609c076754376869bf72560e62b0bc5ed734979 100755
--- a/src/tools/make_ctags
+++ b/src/tools/make_ctags
@@ -10,6 +10,7 @@ ctags --version 2>&1 | grep Exuberant && IS_EXUBERANT="Y"
 
 # List of kinds supported by Exuberant Ctags 5.8
 # generated by ctags --list-kinds
+# --c-kinds was called --c-types before 2003
 #    c  classes
 #    d  macro definitions
 #    e  enumerators (values inside an enumeration)