diff --git a/Source/IGListAdapter.m b/Source/IGListAdapter.m
index f9ba0a5b..b45bff77 100644
--- a/Source/IGListAdapter.m
+++ b/Source/IGListAdapter.m
@@ -272,6 +272,7 @@
     id<IGListAdapterDataSource> dataSource = self.dataSource;
     UICollectionView *collectionView = self.collectionView;
     if (dataSource == nil || collectionView == nil) {
+        IGLKLog(@"Warning: Your call to performUpdatesAnimated-method is ignored as dataSource or collectionView haven't been set.");        
         if (completion) {
             completion(NO);
         }
@@ -308,6 +309,7 @@
     id<IGListAdapterDataSource> dataSource = self.dataSource;
     UICollectionView *collectionView = self.collectionView;
     if (dataSource == nil || collectionView == nil) {
+        IGLKLog(@"Warning: Your call to reloadDataWithCompletion-method is ignored as dataSource or collectionView haven't been set.");        
         if (completion) {
             completion(NO);
         }