diff --git a/docs/release.rst b/docs/release.rst
index 99e80356e..c625039ba 100644
--- a/docs/release.rst
+++ b/docs/release.rst
@@ -20,6 +20,8 @@ Unreleased
 
 * Allow for partial codec specification in V3 array metadata.
   By :user:`Joe Hamman <jhamman>` :issue:`1443`.
+  
+* Add ``__contains__`` method to ``KVStore``. By :user:`Christoph Gohlke <cgohlke>` :issue:`1454`.
 
 .. _release_2.15.0:
 
diff --git a/zarr/storage.py b/zarr/storage.py
index e6c3f62fa..ef1bd6495 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -744,6 +744,9 @@ def __setitem__(self, key, value):
     def __delitem__(self, key):
         del self._mutable_mapping[key]
 
+    def __contains__(self, key):
+        return key in self._mutable_mapping
+
     def get(self, key, default=None):
         return self._mutable_mapping.get(key, default)