Resources: Document that resource class callbacks are optional

diff --git a/ucw/respool.h b/ucw/respool.h
index 2c312cffd9e2912f0bff702b7403c7895ccfe1f1..55f17bee37187097ad9f2707e9ce4b403596d719 100644 (file)
--- a/ucw/respool.h
+++ b/ucw/respool.h
@@ -95,7 +95,7 @@ static inline void res_permanent(struct resource *r)
  * === Resource classes
  *
  * A resource class describes how to handle a particular type of resources.
- * Most importantly, it defines a set of callbacks for performing operations
+ * Most importantly, it defines a set of (optional) callbacks for performing operations
  * on the resources:
  *
  * * dump() should print a description of the resource used for debugging