diff --git a/tree_node.h b/tree_node.h
index 4e16b0a0c..a83cb515c 100644
--- a/tree_node.h
+++ b/tree_node.h
@@ -16,7 +16,6 @@
  */
 
 class TreeNode {
-//  friend class TreeReference<T>;
   friend class TreePool;
 public:
   virtual ~TreeNode() {}
diff --git a/tree_pool.h b/tree_pool.h
index e14401d13..549a066e2 100644
--- a/tree_pool.h
+++ b/tree_pool.h
@@ -134,7 +134,7 @@ private:
         break;
       }
     }
-    assert(newIdentifier != -1); // TODO error handling
+    assert(newIdentifier != -1);
     return newIdentifier;
   }
 
diff --git a/tree_reference.h b/tree_reference.h
index 4ae378391..b23d6700f 100644
--- a/tree_reference.h
+++ b/tree_reference.h
@@ -42,7 +42,6 @@ public:
 
   ~TreeReference() {
     assert(node());
-    //printf("Delete TreeReference of m_id %d, nodeId %d\n", m_identifier, node()->identifier());
     assert(node()->identifier() == m_identifier);
     node()->release();
   }