diff --git a/runtime/doc/eval.txt b/runtime/doc/eval.txt
index 57ab47e..97c968c 100644
--- a/runtime/doc/eval.txt
+++ b/runtime/doc/eval.txt
@@ -2440,6 +2440,7 @@
 				Number	assert {actual} is inside the range
 assert_match({pat}, {text} [, {msg}])
 				Number	assert {pat} matches {text}
+assert_nobeep({cmd})		Number	assert {cmd} does not cause a beep
 assert_notequal({exp}, {act} [, {msg}])
 				Number	assert {exp} is not equal {act}
 assert_notmatch({pat}, {text} [, {msg}])