diff --git a/SUMMARY_320_PI.md b/SUMMARY_320_PI.md
index dfeb476..acffe55 100644
--- a/SUMMARY_320_PI.md
+++ b/SUMMARY_320_PI.md
@@ -73,7 +73,7 @@
   - [3 myCobot API](15-ApplicationBaseCSharp/15.4.1-API-PI.md)
   - [4 Use Cases](15-ApplicationBaseCSharp/15.5.1-case-PI.md)
 
-- [7 Examples of Robots Using])
+- [7 Examples of Robots Using]()
   - [1 PLC-based robotic arm control](1-ProductIntroduction/1.4-AccessoriesTools/1.4.3-Camera/PLC.md)
   - [2 Robot gripper carrying wood block example](7-ExamplesRobotsUsing/320PI_gripper.md)
   - [3 Robot suction pump carrying wood block example](7-ExamplesRobotsUsing/320PI_pump.md)