diff --git a/edx_django_utils/cache/utils.py b/edx_django_utils/cache/utils.py
index d35f68c9..69e0552e 100644
--- a/edx_django_utils/cache/utils.py
+++ b/edx_django_utils/cache/utils.py
@@ -207,6 +207,7 @@ def set_all_tiers(key, value, django_cache_timeout=DEFAULT_TIMEOUT):
                 if and for how long to cache in the django cache. A timeout of
                 0 will skip the django cache. If timeout is provided, use that
                 timeout for the key; otherwise use the default cache timeout.
+                (in seconds)
 
         """
         DEFAULT_REQUEST_CACHE.set(key, value)