diff --git a/Gemfile b/Gemfile
index a981d21..63611a6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,3 +2,6 @@ source 'https://rubygems.org'
 
 gem "grpc"
 gem 'rspec'
+gem 'faraday', '0.11.0'
+
+
diff --git a/README.md b/README.md
index 9971149..c27bb7d 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,10 @@ conn.user_list
 **Role Management**
 ```
 # Add Role
-conn.add_role('rolename', 'readwrite', 'a', 'Z')
+conn.add_role('rolename')
+
+# Grant Permission to Role
+conn.grant_permission_to_role('rolename', 'readwrite', 'a', 'z')
 
 # Delete Role
 conn.delete_role('rolename')
diff --git a/lib/etcdv3.rb b/lib/etcdv3.rb
index a2f68d5..d354465 100644
--- a/lib/etcdv3.rb
+++ b/lib/etcdv3.rb
@@ -45,34 +45,43 @@ def initialize(options = {})
     @metadata[:token] = auth.generate_token(user, password) unless user.nil?
   end
 
+  # Inserts a new key.
   def put(key, value)
     kv.put(key, value)
   end
 
+  # Fetches key(s).
   def get(key, range_end='')
     kv.get(key, range_end)
   end
 
+  # Creates new user.
   def add_user(user, password)
     auth.add_user(user, password)
   end
 
+  # Fetch specified user
   def get_user(user)
     auth.get_user(user)
   end
 
+  # Delete specified user.
   def delete_user(user)
     auth.delete_user(user)
   end
 
+  # Changes the specified users password.
   def change_user_password(user, new_password)
     auth.change_user_password(user, new_password)
   end
 
+  # List all users.
   def user_list
     auth.user_list
   end
 
+  # Authenticate using specified user and password.
+  # On successful authentication, an auth token will be assigned to the instance.
   def authenticate(user, password)
     token = auth.generate_token(user, password)
     if token
@@ -81,39 +90,57 @@ def authenticate(user, password)
       @options[:password] = password
       return true
     end
+    return false
   rescue GRPC::InvalidArgument => exception
-    print exception.message
     return false
   end
 
+  # List all roles.
   def role_list
     auth.role_list
   end
 
-  def add_role(name, permission, key, range_end='')
-    auth.add_role(name, permission, key, range_end)
+  # Add role with specified name.
+  def add_role(name)
+    auth.add_role(name)
   end
 
+  # Fetches a specified role.
   def get_role(name)
     auth.get_role(name)
   end
 
+  # Delete role.
   def delete_role(name)
     auth.delete_role(name)
   end
 
+  # Grants role to an existing user.
   def grant_role_to_user(user, role)
     auth.grant_role_to_user(user, role)
   end
 
+  # Revokes role from a specified user.
   def revoke_role_from_user(user, role)
     auth.revoke_role_from_user(user, role)
   end
 
+  # Grants a new permission to an existing role.
+  def grant_permission_to_role(name, permission, key, range_end='')
+    auth.grant_permission_to_role(name, permission, key, range_end)
+  end
+
+  def revoke_permission_from_role(name, permission, key, range_end='')
+    auth.revoke_permission_from_role(name, permission, key, range_end)
+  end
+
+  # Enables authentication.
   def enable_auth
     auth.enable_auth
   end
 
+  # Disables authentication.
+  # This will clear any active auth / token data.
   def disable_auth
     response = auth.disable_auth
     if response
diff --git a/lib/etcdv3/auth.rb b/lib/etcdv3/auth.rb
index faab3af..e9b8568 100644
--- a/lib/etcdv3/auth.rb
+++ b/lib/etcdv3/auth.rb
@@ -49,14 +49,8 @@ def change_user_password(user, new_password)
       @stub.user_change_password(request, metadata: @metadata)
     end
 
-    def add_role(name, permission, key, range_end)
-      permission = Authpb::Permission.new(
-        permType: Etcd::Auth::PERMISSIONS[permission], key: key, range_end: range_end
-      )
-      @stub.role_add(
-        Authpb::Role.new(name: name, keyPermission: [permission]),
-        metadata: @metadata
-      )
+    def add_role(name)
+      @stub.role_add(Authpb::Role.new(name: name), metadata: @metadata)
     end
 
     def get_role(name)
@@ -78,6 +72,30 @@ def revoke_role_from_user(user, role)
       @stub.user_revoke_role(request, metadata: @metadata)
     end
 
+    def grant_permission_to_role(name, permission, key, range_end)
+      permission = Authpb::Permission.new(
+        permType: Etcd::Auth::PERMISSIONS[permission], key: key, range_end: range_end
+      )
+      @stub.role_grant_permission(
+        Etcdserverpb::AuthRoleGrantPermissionRequest.new(
+          name: name,
+          perm: permission
+        ),
+        metadata: @metadata
+      )
+    end
+
+    def revoke_permission_from_role(name, permission, key, range_end)
+      @stub.role_revoke_permission(
+        Etcdserverpb::AuthRoleRevokePermissionRequest.new(
+          role: name,
+          key: key,
+          range_end: range_end
+        ),
+        metadata: @metadata
+      )
+    end
+
     def role_list
       @stub.role_list(Authpb::Role.new, metadata: @metadata)
     end
diff --git a/spec/etcdv3/auth_spec.rb b/spec/etcdv3/auth_spec.rb
index 0beaac9..82ff0b2 100644
--- a/spec/etcdv3/auth_spec.rb
+++ b/spec/etcdv3/auth_spec.rb
@@ -54,7 +54,7 @@
 
   describe '#add_role' do
     after { conn.delete_role('add_role') }
-    subject { conn.add_role('add_role', 'readwrite', 'a', 'Z') }
+    subject { conn.add_role('add_role') }
     it 'adds a role' do
       expect(subject).to be_an_instance_of(Etcdserverpb::AuthRoleAddResponse)
       expect(conn.role_list.roles).to include('add_role')
@@ -62,14 +62,14 @@
   end
 
   describe '#get_role' do
-    before { conn.add_role('get_role', 'readwrite', 'a', 'Z') }
+    before { conn.add_role('get_role') }
     after { conn.delete_role('get_role') }
     subject { conn.get_role('get_role') }
     it { is_expected.to be_an_instance_of(Etcdserverpb::AuthRoleGetResponse) }
   end
 
   describe '#delete_role' do
-    before { conn.add_role('delete_role', 'readwrite', 'a', 'Z') }
+    before { conn.add_role('delete_role') }
     subject { conn.delete_role('delete_role') }
     it 'deletes role' do
       expect(subject).to be_an_instance_of(Etcdserverpb::AuthRoleDeleteResponse)
@@ -82,6 +82,28 @@
     it { is_expected.to be_an_instance_of(Etcdserverpb::AuthRoleListResponse) }
   end
 
+  describe '#grant_permission_to_role' do
+    before { conn.add_role('grant_perm') }
+    after { conn.delete_role('grant_perm') }
+    subject { conn.grant_permission_to_role('grant_perm', 'write', 'c', 'cc') }
+    it 'sets permission' do
+      expect(subject).to be_an_instance_of(Etcdserverpb::AuthRoleGrantPermissionResponse)
+    end
+  end
+
+  describe '#revoke_permission_from_role' do
+    before do
+      conn.add_role('myrole')
+      conn.grant_permission_to_role('myrole', 'write', 'c', 'cc')
+    end
+    after { conn.delete_role('myrole') }
+    subject { conn.revoke_permission_from_role('myrole', 'write', 'c', 'cc') }
+    it 'revokes permission' do
+      expect(subject).to be_an_instance_of(Etcdserverpb::AuthRoleRevokePermissionResponse)
+      expect(conn.get_role('myrole').perm.size).to eq(0)
+    end
+  end
+
   describe '#disable_auth' do
     before do
       conn.add_user('root', 'test')
diff --git a/spec/helpers/test_instance.rb b/spec/helpers/test_instance.rb
index f6323b4..dac478d 100644
--- a/spec/helpers/test_instance.rb
+++ b/spec/helpers/test_instance.rb
@@ -42,7 +42,7 @@ def spawn_etcd_instance
     end
 
     def stop
-      @pids.each { |pid| Process.kill('TERM', pid) }
+      @pids.each { |pid| Process.kill('TERM', pid) } rescue nil
       FileUtils.remove_entry_secure(@tmpdir, true)
       @pids.clear
     end