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diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -23,6 +23,7 @@ Lessons description:
 - Lesson 18: Handle input from user with the `ReadKeyStroke` function
 - Lesson 19: Boot option modification with the help of `bcfg` command
 - Lesson 20: Intro to Platfrom Configuration Database (PCD). Declare and get simple fixed PCD
+- Lesson 21: Override order for PCD variables
 
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