diff --git a/lib/ansible/plugins/cache/jsonfile.py b/lib/ansible/plugins/cache/jsonfile.py
index 7605dc41112..80b16f55b56 100644
--- a/lib/ansible/plugins/cache/jsonfile.py
+++ b/lib/ansible/plugins/cache/jsonfile.py
@@ -32,7 +32,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
diff --git a/lib/ansible/plugins/cache/memcached.py b/lib/ansible/plugins/cache/memcached.py
index 246eb34daed..35dc7bf885e 100644
--- a/lib/ansible/plugins/cache/memcached.py
+++ b/lib/ansible/plugins/cache/memcached.py
@@ -34,7 +34,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
diff --git a/lib/ansible/plugins/cache/mongodb.py b/lib/ansible/plugins/cache/mongodb.py
index b5cec1ecd20..50ef450e0fd 100644
--- a/lib/ansible/plugins/cache/mongodb.py
+++ b/lib/ansible/plugins/cache/mongodb.py
@@ -35,7 +35,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout in seconds for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
diff --git a/lib/ansible/plugins/cache/pickle.py b/lib/ansible/plugins/cache/pickle.py
index 9876a235cf9..04ab7393f17 100644
--- a/lib/ansible/plugins/cache/pickle.py
+++ b/lib/ansible/plugins/cache/pickle.py
@@ -32,7 +32,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
diff --git a/lib/ansible/plugins/cache/redis.py b/lib/ansible/plugins/cache/redis.py
index 8dcafff3573..127ed70efc5 100644
--- a/lib/ansible/plugins/cache/redis.py
+++ b/lib/ansible/plugins/cache/redis.py
@@ -32,7 +32,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini:
diff --git a/lib/ansible/plugins/cache/yaml.py b/lib/ansible/plugins/cache/yaml.py
index 579b18e9474..7b9768e4b46 100644
--- a/lib/ansible/plugins/cache/yaml.py
+++ b/lib/ansible/plugins/cache/yaml.py
@@ -32,7 +32,7 @@ DOCUMENTATION = '''
             section: defaults
       _timeout:
         default: 86400
-        description: Expiration timeout for the cache plugin data
+        description: Expiration timeout in seconds for the cache plugin data. Set to 0 to never expire
         env:
           - name: ANSIBLE_CACHE_PLUGIN_TIMEOUT
         ini: