Add requirement about callback param

- Fixes #898
expressjs · Jun 25, 2022 · bca7607 · bca7607
1 parent 1010fad
commit bca7607
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diff --git a/README.md b/README.md
@@ -451,6 +451,10 @@ and **optional**.
     available.
   * Optional methods are ones this module does not call at all, but helps
     present uniform stores to users.
+  * The `callback` function parameter may not be truthy at times.
+    Implementers must consider checking `callback` specifically to invoke it
+    only when it is defined.
+
 
 For an example implementation view the [connect-redis](http://github.com/visionmedia/connect-redis) repo.