--- a/artifacts/src/main/java/org/dive4elements/river/collections/CollectionAttribute.java	Fri Sep 06 15:36:59 2013 +0200
+++ b/artifacts/src/main/java/org/dive4elements/river/collections/CollectionAttribute.java	Fri Sep 06 15:37:56 2013 +0200
@@ -66,6 +66,7 @@
     }
 
 
+    /** Remove outputs without facets from outputMap. */
     public void cleanEmptyOutputs() {
         if (outputMap == null) {
             return;
@@ -112,7 +113,7 @@
 
     public void addFacet(String outputKey, Facet facet) {
         if (facet == null) {
-            logger.warn("Tried to add empty facet.");
+            logger.warn("Tried to add null facet.");
             return;
         }
 
@@ -139,6 +140,7 @@
     }
 
 
+    /** Empty facets list for outputKey output. */
     public void clearFacets(String outputKey) {
         if (outputKey == null || outputKey.length() == 0) {
             logger.warn("Tried to clear Facets, but no Output key specified!");