diff --git a/redis/client.py b/redis/client.py
index 9fd5b7ca9e..6a97f96562 100755
--- a/redis/client.py
+++ b/redis/client.py
@@ -694,7 +694,7 @@ class AbstractRedis:
         **string_keys_to_dict(
             "AUTH COPY EXPIRE EXPIREAT PEXPIRE PEXPIREAT "
             "HEXISTS HMSET MOVE MSETNX PERSIST "
-            "PSETEX RENAMENX SISMEMBER SMOVE SETEX SETNX",
+            "PSETEX RENAMENX SMOVE SETEX SETNX",
             bool,
         ),
         **string_keys_to_dict(
diff --git a/redis/commands/core.py b/redis/commands/core.py
index af5384e9ef..e8376d6751 100644
--- a/redis/commands/core.py
+++ b/redis/commands/core.py
@@ -3350,9 +3350,13 @@ def sinterstore(
         args = list_or_args(keys, args)
         return self.execute_command("SINTERSTORE", dest, *args)
 
-    def sismember(self, name: str, value: str) -> Union[Awaitable[bool], bool]:
+    def sismember(
+        self, name: str, value: str
+    ) -> Union[Awaitable[Union[Literal[0], Literal[1]]], Union[Literal[0], Literal[1]]]:
         """
-        Return a boolean indicating if ``value`` is a member of set ``name``
+        Return whether ``value`` is a member of set ``name``:
+        - 1 if the value is a member of the set.
+        - 0 if the value is not a member of the set or if key does not exist.
 
         For more information see https://redis.io/commands/sismember
         """