Add a comment about *not* caching the hash value. Issue #9685 suggested to memorize the hash value, but the feature request was rejected because no speed ups were found.
diff --git a/Objects/tupleobject.c b/Objects/tupleobject.c
index ec3f91b..0a95909 100644
--- a/Objects/tupleobject.c
+++ b/Objects/tupleobject.c
@@ -322,6 +322,9 @@
1082527, 1165049, 1082531, 1165057, 1247581, 1330103, 1082533,
1330111, 1412633, 1165069, 1247599, 1495177, 1577699
+
+ Tests have shown that it's not worth to cache the hash value, see
+ issue #9685.
*/
static Py_hash_t