diff --git a/tools/nonce2key/readme.txt b/tools/nonce2key/readme.txt
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+To test the nonce2key tool.
+
+:: tip
+You can use the output from "hf mf mifare"  to use with this tool. 
+
+:: sample
+./nonce2key e9cadd9c a8bf4a12 a020a8285858b090 050f010607060e07 5693be6c00000000