diff --git a/include/casa_c_authtoken.h b/include/casa_c_authtoken.h
index 38d434b0..4dd91ad3 100644
--- a/include/casa_c_authtoken.h
+++ b/include/casa_c_authtoken.h
@@ -53,15 +53,21 @@ extern "C"
 //++=======================================================================
 extern CasaStatus SSCS_CALL
 ObtainAuthToken(
-   IN    const char *pServiceAtHostName,
+   IN    const char *pServiceName,
+   IN    const char *pHostName,
    INOUT char *pAuthTokenBuf,
    INOUT int *pAuthTokenBufLen);
 //
 //  Arguments: 
-//    pServiceAtHostName -
+//    pServiceName -
 //       Pointer to NULL terminated string that contains the
-//       service@host name to which the client is trying to
-//       authenticate. Note that the host portion of the name
+//       name of the service to which the client is trying to
+//       authenticate.
+//               
+//    pHostName -
+//       Pointer to NULL terminated string that contains the
+//       name of the host where resides the service to which the
+//       client is trying to authenticate. Note that the name
 //       can either be a DNS name or a dotted IP address.
 //               
 //    pAuthTokenBuf -