Update runtime files
diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
index 0db6407..6794785 100644
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -568,6 +568,9 @@
The |:Lfilter| command does the same as |:Cfilter| but operates on the current
location list.
+The current quickfix/location list is not modified by these commands, so you
+can go back to the unfiltered list using the |:colder|/|:lolder| command.
+
=============================================================================
2. The error window *quickfix-window*