diff --git a/doc/docbook.sh b/doc/docbook.sh
index 29dbc6d..a9d498c 100755
--- a/doc/docbook.sh
+++ b/doc/docbook.sh
@@ -27,6 +27,7 @@
 #variables
 PREFIX="/usr/local"
 . "../config.sh"
+#executables
 DEBUG="_debug"
 INSTALL="install -m 0644"
 MKDIR="mkdir -m 0755 -p"