diff --git a/readme.md b/readme.md
index 803aa43..036c3ae 100644
--- a/readme.md
+++ b/readme.md
@@ -19,6 +19,11 @@ isMap(new Map());
 isMap({});
 //=> false
 ```
+## Related
+
+* [`is-weakmap`](https://github.com/arthurvr/is-weakmap)
+* [`is-set`](https://github.com/arthurvr/is-set)
+* [`is-weakset`](https://github.com/arthurvr/is-weakset)
 
 ## License