diff --git a/lib/api_errors.go b/lib/api_errors.go
index 08e2abc..f552abb 100644
--- a/lib/api_errors.go
+++ b/lib/api_errors.go
@@ -11,7 +11,7 @@ type InvalidStatusCodeError string
 type NotFoundError string
 type InvalidRequestError string
 
-var genericAuthorizationError AutorizationError = "autorization failed"
+var genericAuthorizationError AutorizationError = "autorization rejected by registry"
 var genericMalformedResponseError MalformedResponseError = "malformed response"
 
 func (e AutorizationError) Error() string {
diff --git a/lib/auth/authenticator.go b/lib/auth/authenticator.go
index 0fb69bb..2f1972d 100644
--- a/lib/auth/authenticator.go
+++ b/lib/auth/authenticator.go
@@ -49,7 +49,7 @@ func (a *authenticator) Authenticate(c *Challenge, ignoreCached bool) (t Token,
 	}
 
 	if authResponse.StatusCode != http.StatusOK {
-		err = errors.New(fmt.Sprintf("authentication failed with code %d", authResponse.StatusCode))
+		err = errors.New(fmt.Sprintf("authentification against auth server failed with code %d", authResponse.StatusCode))
 		return
 	}