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-rw-r--r--login-utils/su.13
1 files changed, 2 insertions, 1 deletions
diff --git a/login-utils/su.1 b/login-utils/su.1
index f5fecf199..5e529ce3d 100644
--- a/login-utils/su.1
+++ b/login-utils/su.1
@@ -57,7 +57,8 @@ to the shell, which may or may not be useful, depending on the shell.
Specify the primary group. This option is available to the root user only.
.TP
.BR \-G , " \-\-supp\-group" = \fIgroup
-Specify a supplemental group. This option is available to the root user only.
+Specify a supplemental group. This option is available to the root user only. The first specified
+supplementary group is also used as a primary group if the option \fB\-\-group\fR is unspecified.
.TP
.BR \- , " \-l" , " \-\-login"
Start the shell as a login shell with an environment similar to a real