Add parsing/printing for new X.509 keyUsage flags
diff --git a/tests/data_files/Readme-x509.txt b/tests/data_files/Readme-x509.txt
index b68ae51..2cf0c66 100644
--- a/tests/data_files/Readme-x509.txt
+++ b/tests/data_files/Readme-x509.txt
@@ -23,6 +23,7 @@
 - test-ca-v1.crt: v1 "CA", signs
     server1-v1.crt: v1 "intermediate CA", signs
         server2-v1*.crt: EE cert (without of with chain in same file)
+- keyUsage.decipherOnly.crt: has the decipherOnly keyUsage bit set
 
 End-entity certificates
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