improve comment on optional dep changes

src/main/java/org/jboss/weld/environment/se/discovery/url/WeldSEResourceLoader.java

@@ -55,7 +55,11 @@ public Class<?> classForName(String name)
          // then a CNFE can be thrown later in the deployment process when the
          // Introspector is inspecting the class. We call getMethods, getFields
          // and getConstructors now over the whole type heirachey to force 
-         // these errors to occur early
+         // these errors to occur early. 
+         // NOTE it is still possible for a CNFE to be thrown at runtime if
+         // a class has methods that refer to classes that are not present in
+         // their bytecode, this only checks for classes that form part of the
+         // class schema that are not present
          Class<?> obj = clazz;
          while (obj != null && obj != Object.class)
          {