diff --git a/List-of-Navigators.md b/List-of-Navigators.md
index e11059f..e1089fa 100644
--- a/List-of-Navigators.md
+++ b/List-of-Navigators.md
@@ -10,6 +10,7 @@
     - [END](#end)
     - [FIRST](#first)
     - [LAST](#last)
+    - [MAP-KEYS](#map-keys)
     - [MAP-VALS](#map-vals)
     - [META](#meta)
     - [NIL->LIST](#nil-list)
@@ -168,6 +169,15 @@ nil
 nil
 ```
 
+## MAP-KEYS
+
+`MAP-KEYS` navigates to every key in a map. `MAP-VALS` is more efficient than `[ALL FIRST]`.
+
+```clojure
+=> (select [MAP-KEYS] {:a 3 :b 4})
+[:a :b]
+```
+
 ## MAP-VALS
 
 `MAP-VALS` navigates to every value in a map. `MAP-VALS` is more efficient than `[ALL LAST]`.