diff --git a/src/is-room-visible/readme.md b/src/is-room-visible/readme.md
index 5bb2d3d..c220197 100644
--- a/src/is-room-visible/readme.md
+++ b/src/is-room-visible/readme.md
@@ -13,5 +13,8 @@ import { isRoomVisible } from '@open-screeps/is-room-visible';
 const observerTargets = Object.keys(Memory.rooms).filter(r => isRoomVisible(r));
 ```
 
+## Related
+- [is-simulation](https://github.com/PostCrafter/open-screeps/tree/master/src/is-simulation)
+
 ## License
 [MIT](../../license.md)