Update runtime files.
diff --git a/runtime/doc/quickfix.txt b/runtime/doc/quickfix.txt
index 211fe96..3ef3be8 100644
--- a/runtime/doc/quickfix.txt
+++ b/runtime/doc/quickfix.txt
@@ -1557,8 +1557,8 @@
    packadd cfilter
 
 Then you can use these command: >
-   :Cfilter[!] {pat}
-   :Lfilter[!] {pat}
+   :Cfilter[!] /{pat}/
+   :Lfilter[!] /{pat}/
 
 :Cfilter creates a new quickfix list from entries matching {pat} in the
 current quickfix list. Both the file name and the text of the entries are