diff --git a/usr.bin/diff/diff.1 b/usr.bin/diff/diff.1
index c10b130a2d7..3996f038866 100644
--- a/usr.bin/diff/diff.1
+++ b/usr.bin/diff/diff.1
@@ -29,7 +29,7 @@
 .\"
 .\"     @(#)diff.1	8.1 (Berkeley) 6/30/93
 .\"
-.Dd June 29, 2024
+.Dd July 26, 2024
 .Dt DIFF 1
 .Os
 .Sh NAME
@@ -199,7 +199,7 @@
 .Op Fl aBbditwW
 .Op Fl -color Ns = Ns Ar when
 .Op Fl -expand-tabs
-.Op Fl -ignore-all-blanks
+.Op Fl -ignore-all-space
 .Op Fl -ignore-blank-lines
 .Op Fl -ignore-case
 .Op Fl -minimal
@@ -422,7 +422,7 @@ output adds character(s) to the front of each line which may screw up
 the indentation of the original source lines and make the output listing
 difficult to interpret.
 This option will preserve the original source's indentation.
-.It Fl w -ignore-all-blanks
+.It Fl w -ignore-all-space
 Is similar to
 .Fl b -ignore-space-change
 but causes whitespace (blanks and tabs) to be totally ignored.
diff --git a/usr.bin/diff/diff.c b/usr.bin/diff/diff.c
index 24e851ae9db..ba88964ca13 100644
--- a/usr.bin/diff/diff.c
+++ b/usr.bin/diff/diff.c
@@ -592,7 +592,7 @@ usage(void)
 	    "       diff [-aBbdilNPprsTtw] [-c | -e | -f | -n | -q | -u] [--ignore-case]\n"
 	    "            [--no-ignore-case] [--normal] [--tabsize] [-I pattern] [-L label]\n"
 	    "            [-F pattern] [-S name] [-X file] [-x pattern] dir1 dir2\n"
-	    "       diff [-aBbditwW] [--expand-tabs] [--ignore-all-blanks]\n"
+	    "       diff [-aBbditwW] [--expand-tabs] [--ignore-all-space]\n"
 	    "            [--ignore-blank-lines] [--ignore-case] [--minimal]\n"
 	    "            [--no-ignore-file-name-case] [--strip-trailing-cr]\n"
 	    "            [--suppress-common-lines] [--tabsize] [--text] [--width]\n"