@@ 6,6 6,12 @@ table.
 
 `keys` and `values` are bytes.
 
+To initialize the cache, type:
+
+```bash
+$ dbcache init-db postgresql://foo:bar@postgresql/mydb
+```
+
 Example usage:
 
 ```python

          
@@ 27,3 33,6 @@ Example usage:
   sleep(1)
   assert cache.get(b'b') is None
 ```
+
+If you merely want a simple key-value store, you can use very long
+lifetimes (e.g. `timedelta(days=9999)`).