diff --git a/src/main.c b/src/main.c
index 9c3bce9..a37a583 100644
--- a/src/main.c
+++ b/src/main.c
@@ -236,6 +236,13 @@ void monitor_update(struct Monitor *monitor) {
     pipeline_invalidate(monitor->pipeline);
 }
 
+void monitors_update(void) {
+    struct Monitor *monitor;
+    wl_list_for_each(monitor, &monitors, link) {
+        monitor_update(monitor);
+    }
+}
+
 void pipe_in(int fd, short mask, void *data) {
     running = 0;
 }
diff --git a/src/main.h b/src/main.h
index 175a5e1..1eb15c7 100644
--- a/src/main.h
+++ b/src/main.h
@@ -22,6 +22,7 @@ struct Monitor {
 };
 
 void panic(const char *fmt, ...);
+void monitors_update(void);
 struct Monitor *monitor_from_surface(const struct wl_surface *surface);
 
 extern struct wl_compositor *compositor;