diff --git a/usr.bin/diff/diff.1 b/usr.bin/diff/diff.1
index eb6b16f2e63d..a8dcc1b5beb3 100644
--- a/usr.bin/diff/diff.1
+++ b/usr.bin/diff/diff.1
@@ -30,7 +30,7 @@
 .\"     @(#)diff.1	8.1 (Berkeley) 6/30/93
 .\" $FreeBSD$
 .\"
-.Dd February 13, 2020
+.Dd June 1, 2020
 .Dt DIFF 1
 .Os
 .Sh NAME
@@ -330,7 +330,7 @@ Use of this option forces
 to produce a diff.
 .It Fl B Fl -ignore-blank-lines
 Causes chunks that include only blank lines to be ignored.
-.It Fl b
+.It Fl b -ignore-space-change
 Causes trailing blanks (spaces and tabs) to be ignored, and other
 strings of blanks to compare equal.
 .It Fl d -minimal