diff --git a/avers-api.cabal b/avers-api.cabal
--- a/avers-api.cabal
+++ b/avers-api.cabal
@@ -1,7 +1,7 @@
 name:                avers-api
-version:             0.0.18.0
+version:             0.1.0
 synopsis:            Types describing the core and extended Avers APIs
-description:         See README
+description:         Types describing the core and extended Avers APIs
 homepage:            http://github.com/wereHamster/avers-api
 license:             MIT
 license-file:        LICENSE
diff --git a/src/Avers/API/Credentials.hs b/src/Avers/API/Credentials.hs
--- a/src/Avers/API/Credentials.hs
+++ b/src/Avers/API/Credentials.hs
@@ -13,5 +13,6 @@
 -- passed along with the request.
 
 data Credentials
-    = SessionIdCredential !SessionId
+    = CredAnonymous
+    | CredSessionId !SessionId
     -- AccessTokenCredential !AccessToken