diff --git a/extensions/libxt_devgroup.man b/extensions/libxt_devgroup.man
new file mode 100644
index 0000000..4a66c9f
--- /dev/null
+++ b/extensions/libxt_devgroup.man
@@ -0,0 +1,7 @@
+Match device group of a packets incoming/outgoing interface.
+.TP
+[\fB!\fP] \fB\-\-src\-group\fP \fIname\fP
+Match device group of incoming device
+.TP
+[\fB!\fP] \fB\-\-dst\-group\fP \fIname\fP
+Match device group of outgoing device