diff --git a/keystoneclient/auth/identity/v2.py b/keystoneclient/auth/identity/v2.py
index 995044fef..bad0eac0a 100644
--- a/keystoneclient/auth/identity/v2.py
+++ b/keystoneclient/auth/identity/v2.py
@@ -107,6 +107,11 @@ class Password(Auth):
     :param string username: Username for authentication.
     :param string password: Password for authentication.
     :param string user_id: User ID for authentication.
+    :param string trust_id: Trust ID for trust scoping.
+    :param string tenant_id: Tenant ID for tenant scoping.
+    :param string tenant_name: Tenant name for tenant scoping.
+    :param bool reauthenticate: Allow fetching a new token if the current one
+                                is going to expire. (optional) default True
 
     :raises TypeError: if a user_id or username is not provided.
     """
@@ -160,6 +165,11 @@ class Token(Auth):
 
     :param string auth_url: Identity service endpoint for authorization.
     :param string token: Existing token for authentication.
+    :param string tenant_id: Tenant ID for tenant scoping.
+    :param string tenant_name: Tenant name for tenant scoping.
+    :param string trust_id: Trust ID for trust scoping.
+    :param bool reauthenticate: Allow fetching a new token if the current one
+                                is going to expire. (optional) default True
     """
 
     def __init__(self, auth_url, token, **kwargs):
diff --git a/keystoneclient/auth/identity/v3.py b/keystoneclient/auth/identity/v3.py
index 8f723ff0f..6bb517ffa 100644
--- a/keystoneclient/auth/identity/v3.py
+++ b/keystoneclient/auth/identity/v3.py
@@ -237,6 +237,25 @@ class PasswordMethod(AuthMethod):
 
 
 class Password(AuthConstructor):
+    """A plugin for authenticating with a username and password.
+
+    :param string auth_url: Identity service endpoint for authentication.
+    :param string password: Password for authentication.
+    :param string username: Username for authentication.
+    :param string user_id: User ID for authentication.
+    :param string user_domain_id: User's domain ID for authentication.
+    :param string user_domain_name: User's domain name for authentication.
+    :param string trust_id: Trust ID for trust scoping.
+    :param string domain_id: Domain ID for domain scoping.
+    :param string domain_name: Domain name for domain scoping.
+    :param string project_id: Project ID for project scoping.
+    :param string project_name: Project name for project scoping.
+    :param string project_domain_id: Project's domain ID for project.
+    :param string project_domain_name: Project's domain name for project.
+    :param bool reauthenticate: Allow fetching a new token if the current one
+                                is going to expire. (optional) default True
+    """
+
     _auth_method_class = PasswordMethod
 
     @classmethod
@@ -269,6 +288,21 @@ class TokenMethod(AuthMethod):
 
 
 class Token(AuthConstructor):
+    """A plugin for authenticating with an existing Token.
+
+    :param string auth_url: Identity service endpoint for authentication.
+    :param string token: Token for authentication.
+    :param string trust_id: Trust ID for trust scoping.
+    :param string domain_id: Domain ID for domain scoping.
+    :param string domain_name: Domain name for domain scoping.
+    :param string project_id: Project ID for project scoping.
+    :param string project_name: Project name for project scoping.
+    :param string project_domain_id: Project's domain ID for project.
+    :param string project_domain_name: Project's domain name for project.
+    :param bool reauthenticate: Allow fetching a new token if the current one
+                                is going to expire. (optional) default True
+    """
+
     _auth_method_class = TokenMethod
 
     def __init__(self, auth_url, token, **kwargs):