Clarification for 'add_to_module' docs

docs/source/170_hooks.rst

@@ -183,7 +183,7 @@ used in the Lmod program.
   This hook allows a site to add contents to a module file (e.g. add
   ``add_property(...)`` based on the location of the module file). It
   provides a table ``{path, name, version, contents}`` as a parameter and
-  should return an indexed table of strings to add to the module file.
+  should return an indexed table of strings to add to the module file as lines.
 
 
 Example Hook: msgHook