diff --git a/zarr/storage.py b/zarr/storage.py
index e17a8ea2e0..c6e38ee052 100644
--- a/zarr/storage.py
+++ b/zarr/storage.py
@@ -1027,8 +1027,9 @@ class FSStore(MutableMapping):
         The destination to map. Should include protocol and path,
         like "s3://bucket/root"
     normalize_keys : bool
-    key_separator : str (deprecated)
-        See dimension_separator
+    key_separator : str
+        public API for accessing dimension_separator. Never `None`
+        See dimension_separator for more informatino.
     mode : str
         "w" for writable, "r" for read-only
     exceptions : list of Exception subclasses
@@ -1054,14 +1055,10 @@ def __init__(self, url, normalize_keys=True, key_separator=None,
         self.mode = mode
         self.exceptions = exceptions
 
-        # Handle deprecated properties
+        # For backwards compatibility. Guaranteed to be non-None
         if key_separator is not None:
-            warnings.warn(
-                "key_separator has been replaced by dimension_separator "
-                "in 2.8.0", DeprecationWarning)
             dimension_separator = key_separator
 
-        # For backwards compatibility. Guaranteed to be non-None
         self.key_separator = dimension_separator
         if self.key_separator is None:
             self.key_separator = "."
@@ -1651,7 +1648,7 @@ class DBMStore(MutableMapping):
     write_lock: bool, optional
         Use a lock to prevent concurrent writes from multiple threads (True by default).
     dimension_separator : {'.', '/'}, optional
-        Separator placed between the dimensions of a chunk.
+        Separator placed between the dimensions of a chunk.e
     **open_kwargs
         Keyword arguments to pass the `open` function.
 
diff --git a/zarr/tests/test_storage.py b/zarr/tests/test_storage.py
index a38bfc4c3c..dc277dda7e 100644
--- a/zarr/tests/test_storage.py
+++ b/zarr/tests/test_storage.py
@@ -1069,11 +1069,10 @@ def create_store(self, normalize_keys=False, key_separator=".", **kwargs):
 
         path = tempfile.mkdtemp()
         atexit.register(atexit_rmtree, path)
-        with pytest.warns(DeprecationWarning):
-            return FSStore(
-                path,
-                normalize_keys=normalize_keys,
-                key_separator=key_separator)
+        return FSStore(
+            path,
+            normalize_keys=normalize_keys,
+            key_separator=key_separator)
 
 
 @pytest.fixture()