diff --git a/README.md b/README.md
index 6ea6c72..f8a2a7c 100644
--- a/README.md
+++ b/README.md
@@ -12,8 +12,8 @@ The program needs to run as root.
 Todos
 ====
 - [x] improve log reading efficiency, potentially using pytailer
-- [ ] remove instance or change configuration
+- [x] remove instance or change configuration
 - [ ] improve ui using template, move to ajax
 - [ ] parameterize inline constants
 - [ ] refractor code
-- [ ] documentations
\ No newline at end of file
+- [ ] documentations
diff --git a/o_manager.py b/o_manager.py
index 58312ba..5f866dc 100644
--- a/o_manager.py
+++ b/o_manager.py
@@ -91,6 +91,8 @@ class OManager:
         instance["op"].stop()
         instance["weight"] = 0
         self.instances.remove(instance)
+        if len(self.instances)==0:
+            self.new_idx = 0
         self.reset_lb()
 
     def remove_all_op(self):