diff --git a/doit/task.py b/doit/task.py
index f864d1a7..0fdd15f6 100644
--- a/doit/task.py
+++ b/doit/task.py
@@ -672,3 +672,6 @@ def result_saver():
         if last_success is None:
             return False
         return last_success == dep_result
+
+    def __repr__(self):
+        return 'result_dep("%s")' % self.dep_name
diff --git a/doit/tools.py b/doit/tools.py
index 1dc4a09f..2d882936 100644
--- a/doit/tools.py
+++ b/doit/tools.py
@@ -79,6 +79,9 @@ def __call__(self, task, values):
             return False
         return (last_success == self.config_digest)
 
+    def __repr__(self):
+        return "config_changed(%r)" % self.config
+
 
 
 # uptodate