patch 8.0.0034
Problem:    No completion for ":messages".
Solution:   Complete "clear" argument. (Hirohito Higashi)
diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index d4a005a..88599dd 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -4287,7 +4287,9 @@
 		locale		locale names (as output of locale -a)
 		mapping		mapping name
 		menu		menus
+		messages	|:messages| suboptions
 		option		options
+		packadd		optional package |pack-add| names
 		shellcmd	Shell command
 		sign		|:sign| suboptions
 		syntax		syntax file names |'syntax'|
diff --git a/runtime/doc/map.txt b/runtime/doc/map.txt
index 7989d64..25ed827 100644
--- a/runtime/doc/map.txt
+++ b/runtime/doc/map.txt
@@ -1280,6 +1280,7 @@
 	-complete=locale	locale names (as output of locale -a)
 	-complete=mapping	mapping name
 	-complete=menu		menus
+	-complete=messages	|:messages| suboptions
 	-complete=option	options
 	-complete=packadd	optional package |pack-add| names
 	-complete=shellcmd	Shell command