diff --git a/lib/puppet/parser/files.rb b/lib/puppet/parser/files.rb
index 30187ca7f8b..38ab0c10846 100644
--- a/lib/puppet/parser/files.rb
+++ b/lib/puppet/parser/files.rb
@@ -29,9 +29,10 @@ def find_manifests_in_modules(pattern, environment)
   #   * modulename/filename selector: a file is found in the file directory
   #     of the named module.
   #
-  # In the second case a nil is returned if there isn't a file found. In the
-  # first case (absolute path), there is no existence check done and so the
-  # path will be returned even if there isn't a file available.
+  # If this function is called via "puppet agent", the check for file existence
+  # is performed on the Puppet Primary server. If run via "puppet apply", the
+  # check is performed on the local host. In both cases, the check is performed
+  # before any resources are changed, and a nil is returned if no file is found.
   #
   # @param template [String] the file selector
   # @param environment [Puppet::Node::Environment] the environment in which to search