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diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile
--- a/share/man/man9/Makefile
+++ b/share/man/man9/Makefile
@@ -1157,6 +1157,7 @@
g_provider.9 g_error_provider.9 \
g_provider.9 g_new_providerf.9
MLINKS+=gone_in.9 gone_in_dev.9
+MLINKS+=groupmember.9 realgroupmember.9
MLINKS+=hash.9 hash32.9 \
hash.9 hash32_buf.9 \
hash.9 hash32_str.9 \
diff --git a/share/man/man9/groupmember.9 b/share/man/man9/groupmember.9
--- a/share/man/man9/groupmember.9
+++ b/share/man/man9/groupmember.9
@@ -36,6 +36,8 @@
.In sys/ucred.h
.Ft int
.Fn groupmember "gid_t gid" "struct ucred *cred"
+.Ft int
+.Fn realgroupmember "gid_t gid" "struct ucred *cred"
.Sh DESCRIPTION
The
.Fn groupmember
@@ -49,6 +51,11 @@
.Fa cred
are the effective and supplementary groups.
The real group is not taken into account.
+.Pp
+Function
+.Fn realgroupmember
+works the same except that it considers instead the real and supplementary
+groups, and not the effective one.
.Sh RETURN VALUES
If the
.Fa gid

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