Add ttl_offset argument for Redis backend

1 files changed, 8 insertions, 4 deletions

diff --git a/docs/user_guide/backends/redis.md b/docs/user_guide/backends/redis.md
index 141834c..56df69a 100644
--- a/docs/user_guide/backends/redis.md
+++ b/docs/user_guide/backends/redis.md
@@ -46,12 +46,16 @@ or disabled entirely. See [Redis Persistence](https://redis.io/topics/persistenc
 ## Expiration
 Redis natively supports TTL on a per-key basis, and can automatically remove expired responses from
 the cache. This will be set by by default, according to normal {ref}`expiration settings <expiration>`.
-
-Expired items are not removed immediately, but will never be returned from the cache. See
-[Redis: EXPIRE](https://redis.io/commands/expire/) docs for more details.
+See [Redis: EXPIRE](https://redis.io/commands/expire/) docs for more details on internal TTL behavior.
 
 If you intend to reuse expired responses, e.g. with {ref}`conditional-requests` or `stale_if_error`,
-you can disable this behavior with the `ttl` argument:
+you can use the `ttl_offset` argument to add additional time before deletion (default: 1 hour).
+In other words, this makes backend expiration longer than cache expiration:
+```python
+>>> backend = RedisCache(ttl_offset=3600)
+```
+
+Alternatively, you can disable TTL completely with the `ttl` argument:
 ```python
 >>> backend = RedisCache(ttl=False)
 ```