diff --git a/unit06_trust_dig_cert/lab/README.MD b/unit06_trust_dig_cert/lab/README.MD
index d23f3b6..a238872 100644
--- a/unit06_trust_dig_cert/lab/README.MD
+++ b/unit06_trust_dig_cert/lab/README.MD
@@ -494,6 +494,9 @@ Run the code and answer the following questions:
 * Which key (public or private key) is used to verify the signature?
 * Which key (public or private key) is used to verify the signature?
 
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 ## What I should have learnt from this lab?
 The key things learnt: