diff --git a/usr.bin/expand/expand.1 b/usr.bin/expand/expand.1
--- a/usr.bin/expand/expand.1
+++ b/usr.bin/expand/expand.1
@@ -78,9 +78,15 @@
 .Fl a
 option is given, then tabs are inserted whenever they would compress the
 resultant file by replacing two or more characters.
-.It Fl t Ar tab1 , tab2 , ... , tabn
+.It Fl t Xo
+.Sm off
+.Ar tab1 , tab2 , ... , tabn
+.Sm on
+.Xc
 Set tab stops at column positions
+.Sm off
 .Ar tab1 , tab2 , ... , tabn .
+.Sm on
 If only a single number is given, tab stops are set that number of
 column positions apart instead of the default number of 8.
 .El