Drawing-to-the-galaxy-map.md

@@ -143,3 +143,19 @@ public class MyGameMapListener implements GameMapDrawListener {
 
 # Siding
 - This is all client-side.
+
+# Registering your listener
+- Map drawing is called too many times to be a regular event, so it's done through FastListeners.
+```java
+    private MyGameMapListener myGameMapListener;
+    @Override
+    public void onDisable() {
+         FastListenerCommon.getGameMapListeners().remove(myGameMapListener);
+    }
+
+    @Override
+    public void onEnable() {
+        myGameMapListener = new MyGameMapListener();
+        FastListenerCommon.getGameMapListeners().add(myGameMapListener);
+    }  
+```