diff --git a/check.txt b/check.txt
index c69e44d5..c484b3c8 100644
--- a/check.txt
+++ b/check.txt
@@ -22,6 +22,15 @@ should be  Idle-Control
 [bad link](Idle-Control.md)
 should be  Idle-Control
 
+[bad link](Idle-Control.md#valve-initialization)
+should be  Idle-Control#valve-initialization
+
+[bad link](Idle-Control#Valve-initialization)
+should be  Idle-Control#valve-initialization
+
+[bad link](Idle-Control#valve_initialization)
+should be  Idle-Control#valve-initialization
+
 ![good img](Images/Red_LED.png)
 
 ![bad img](Images/Red-LED.png)