diff --git a/lib/ansible/modules/packaging/os/apt.py b/lib/ansible/modules/packaging/os/apt.py
index 67d4388cd8..95401c38e0 100644
--- a/lib/ansible/modules/packaging/os/apt.py
+++ b/lib/ansible/modules/packaging/os/apt.py
@@ -41,7 +41,7 @@ options:
   cache_valid_time:
     description:
       - Update the apt cache if its older than the I(cache_valid_time). This option is set in seconds.
-        As of Ansible 2.4, this implicitly sets I(update_cache) if set.
+        As of Ansible 2.4, this sets I(update_cache=yes).
     default: 0
   purge:
     description: