diff --git a/include/seat.h b/include/seat.h
index 4faf0fc..850d68e 100644
--- a/include/seat.h
+++ b/include/seat.h
@@ -26,6 +26,9 @@ struct seat {
 	uint32_t id;
 	uint32_t capabilities;
 	char name[256];
+
+	void (*on_capability_change)(struct seat*);
+	void* userdata;
 };
 
 struct seat* seat_new(struct wl_seat* wl_seat, uint32_t id);
diff --git a/src/seat.c b/src/seat.c
index d6bf333..020d7fc 100644
--- a/src/seat.c
+++ b/src/seat.c
@@ -29,6 +29,9 @@ static void seat_capabilities(void* data, struct wl_seat* wl_seat,
 	struct seat* self = data;
 
 	self->capabilities = capabilities;
+
+	if (self->on_capability_change)
+		self->on_capability_change(self);
 }
 
 static void seat_name(void* data, struct wl_seat* wl_seat, const char* name)