diff --git a/Resources/docs/adapters/cache.md b/Resources/docs/adapters/cache.md
index 4bc1745..7e016fd 100644
--- a/Resources/docs/adapters/cache.md
+++ b/Resources/docs/adapters/cache.md
@@ -6,7 +6,7 @@ Adapter which allows you to cache other adapters
 
  * `source` The source adapter that must be cached *(required)*
  * `cache` The adapter used to cache the source *(required)*
- * `ttl` Time to live *(default 0)*
+ * `ttl` Time to live, in seconds *(default 0)*
  * `serializer` The adapter used to cache serializations *(default null)*
 
 ## Example
@@ -35,4 +35,4 @@ knp_gaufrette:
     filesystems:
         media:
             adapter: media_cache
-```
\ No newline at end of file
+```