diff --git a/Notes/01_Introduction/02_Hello_world.md b/Notes/01_Introduction/02_Hello_world.md
index 4794f1e..46868ac 100644
--- a/Notes/01_Introduction/02_Hello_world.md
+++ b/Notes/01_Introduction/02_Hello_world.md
@@ -476,4 +476,4 @@ an identifying filename and line number.
 * Run the program successfully
 
 
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+[Contents](../Contents) \| [Previous (1.1 Python)](01_Python) \| [Next (1.3 Numbers)](03_Numbers)