diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 5e0be58..ebd21ae 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -3099,6 +3099,11 @@
 			if coming from a mapping.  This matters for undo,
 			opening folds, etc.
 		'i'	Insert the string instead of appending (see above).
+		'x'	Execute commands until typeahead is empty.  This is
+			similar to using ":normal!".  You can call feedkeys()
+			several times without 'x' and then one time with 'x'
+			(possibly with an empty {string}) to execute all the
+			typeahead.
 		Return value is always 0.
 
 filereadable({file})					*filereadable()*