diff --git a/lisp/subr.el b/lisp/subr.el
index 9087f9a4044..62f72734e14 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -3535,8 +3535,7 @@ character.  This is not possible when using `read-key', but using
 Return t if answer is \"y\" and nil if it is \"n\".
 
 PROMPT is the string to display to ask the question; `y-or-n-p'
-adds \" (y or n) \" to it.  It does not need to end in space, but
-if it does up to one space will be removed.
+adds \"(y or n) \" to it.
 
 If you bind the variable `help-form' to a non-nil value
 while calling this function, then pressing `help-char'
diff --git a/src/fns.c b/src/fns.c
index 51ef1153fb7..1aaf17914a2 100644
--- a/src/fns.c
+++ b/src/fns.c
@@ -3168,8 +3168,7 @@ DEFUN ("yes-or-no-p", Fyes_or_no_p, Syes_or_no_p, 1, 1, 0,
 Return t if answer is yes, and nil if the answer is no.
 
 PROMPT is the string to display to ask the question; `yes-or-no-p'
-adds \"(yes or no) \" to it.  It does not need to end in space, but if
-it does up to one space will be removed.
+adds \"(yes or no) \" to it.
 
 The user must confirm the answer with RET, and can edit it until it
 has been confirmed.