diff --git a/bin/df/df.1 b/bin/df/df.1
index ab5a318a59a9..01c6b17b56b5 100644
--- a/bin/df/df.1
+++ b/bin/df/df.1
@@ -37,7 +37,7 @@
 .Sh SYNOPSIS
 .Nm
 .Oo
-.Fl b | h | H | k |
+.Fl b | g | h | H | k |
 .Fl m | P
 .Oc
 .Op Fl aciln