diff --git a/nav_src/prompt/planner_prompt.py b/nav_src/prompt/planner_prompt.py
index ce97317..74480a3 100644
--- a/nav_src/prompt/planner_prompt.py
+++ b/nav_src/prompt/planner_prompt.py
@@ -256,6 +256,8 @@ You will receive a trajectory instruction at the start and will have access to s
 
 - Notice: You should have a good strategy to check whether the target object exists in the target room, and stop when you exploring all viewpoint in the target room.
 
+Explore the environment while avoiding revisiting viewpoints by comparing current and previously visited IDs
+
 If you think you are moving in circles, please stop and think whether any other objects may be hiden. If no, please output 'Final Answer: Not found'.
 
 Continue by considering your location and the next viewpoint based on the instruction, using the action_maker tool.