diff --git a/lib/asn1/digest.asn1 b/lib/asn1/digest.asn1
index b7289424a..235d1f8cd 100644
--- a/lib/asn1/digest.asn1
+++ b/lib/asn1/digest.asn1
@@ -32,7 +32,7 @@ DigestRequest ::= SEQUENCE  {
     qop			[2] UTF8String OPTIONAL,
     opaque		UTF8String -- same as "DigestInitReply.opaque"
 }
--- opaque = hex(cksum(type|serverNonce|hostname,sessionkey))
+-- opaque = hex(cksum(type|serverNonce|hostname,digest-key))
 -- serverNonce = hex(time[4bytes]random[12bytes])(-cbType:cbBinding)