diff --git a/.travis.yml b/.travis.yml
index 5c042de70..6d57bbc8c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -30,6 +30,6 @@ script: "./script/ci/build.sh"
 notifications:
   irc:
     channels:
-      - "irc.freenode.org:6667#diaspora-dev"
+      - secure: YvYkeTAw+5oOl/RaXVwu7JkKGNWPoFosNQRmLvJkBFbWzZ1s5LZD1u3+Qj819bT3lGzJu9pxmJg765IRYrGWmBi4mcAV3dpO6qowVdFTcorf0JsnLw3Kvkga9rrDunsRNr21KTAQqHOO5mKUzw9DtMzd52BiWuZwIj3xcl72gQI=
     template:
       - "%{repository_slug}#%{commit} (%{branch} - %{commit_subject}): %{message} %{build_url}"
diff --git a/Changelog.md b/Changelog.md
index d3e6a457f..fda559717 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,3 +1,16 @@
+# 0.5.9.0
+
+## Refactor
+* Remove unused mentions regex [#6810](https://github.com/diaspora/diaspora/pull/6810)
+
+## Bug fixes
+* Fix back to top button not appearing on Webkit browsers [#6782](https://github.com/diaspora/diaspora/pull/6782)
+* Don't reset the notification timestamp when marking them as read [#6821](https://github.com/diaspora/diaspora/pull/6821)
+
+## Features
+
+* The sender's diaspora-ID is now shown in invitation mails [#6817](https://github.com/diaspora/diaspora/pull/6817)
+
 # 0.5.8.0
 
 ## Refactor
diff --git a/app/assets/javascripts/app/views/back_to_top_view.js b/app/assets/javascripts/app/views/back_to_top_view.js
index 66c516475..0289c8fb0 100644
--- a/app/assets/javascripts/app/views/back_to_top_view.js
+++ b/app/assets/javascripts/app/views/back_to_top_view.js
@@ -16,7 +16,7 @@ app.views.BackToTop = Backbone.View.extend({
   },
 
   toggleVisibility: function() {
-    if($("html, body").scrollTop() > 1000) {
+    if($(document).scrollTop() > 1000) {
       $("#back-to-top").addClass("visible");
     } else {
       $("#back-to-top").removeClass("visible");
diff --git a/app/controllers/invitations_controller.rb b/app/controllers/invitations_controller.rb
index 1801c39fe..6acf3602d 100644
--- a/app/controllers/invitations_controller.rb
+++ b/app/controllers/invitations_controller.rb
@@ -39,7 +39,7 @@ class InvitationsController < ApplicationController
       else
         params[:invitation_code]
       end
-
+    @inviter = user || InvitationCode.where(id: params[:invitation_code]).first.try(:user)
     if @invitation_code.present?
       render 'notifier/invite', :layout => false
     else
diff --git a/app/models/mention.rb b/app/models/mention.rb
index 47c2f719a..caab2a8b2 100644
--- a/app/models/mention.rb
+++ b/app/models/mention.rb
@@ -3,8 +3,6 @@
 #   the COPYRIGHT file.
 
 class Mention < ActiveRecord::Base
-  REGEX = /@\{([^;]+); ([^\}]+)\}/
-
   belongs_to :post
   belongs_to :person
   validates :post, :presence => true
diff --git a/app/models/notification.rb b/app/models/notification.rb
index 4cec79128..91d697a47 100644
--- a/app/models/notification.rb
+++ b/app/models/notification.rb
@@ -9,7 +9,7 @@ class Notification < ActiveRecord::Base
   belongs_to :target, :polymorphic => true
 
   attr_accessor :note_html
- 
+
   def self.for(recipient, opts={})
     self.where(opts.merge!(:recipient_id => recipient.id)).order('updated_at desc')
   end
@@ -29,7 +29,7 @@ class Notification < ActiveRecord::Base
                                       actor, note_type)
     end
     return_note.email_the_user(target, actor) if return_note
-    return_note 
+    return_note
   end
 
   def as_json(opts={})
@@ -41,7 +41,7 @@ class Notification < ActiveRecord::Base
   end
 
   def set_read_state( read_state )
-    self.update_attributes( :unread => !read_state )
+    update_column(:unread, !read_state)
   end
 
   def mail_job
diff --git a/app/views/notifier/invite.markerb b/app/views/notifier/invite.markerb
index f5222067b..1e00c6c0a 100644
--- a/app/views/notifier/invite.markerb
+++ b/app/views/notifier/invite.markerb
@@ -1 +1 @@
-<%= t('.message', :invite_url => invite_code_url(@invitation_code), :diasporafoundation_url => 'https://diasporafoundation.org/') %>
+<%= t('.message', :invite_url => invite_code_url(@invitation_code), :diasporafoundation_url => 'https://diasporafoundation.org/', :diaspora_id => @inviter.try(:diaspora_handle)) %>
diff --git a/config/defaults.yml b/config/defaults.yml
index 85c853cc6..d32ed1c3e 100644
--- a/config/defaults.yml
+++ b/config/defaults.yml
@@ -4,7 +4,7 @@
 
 defaults:
   version:
-    number: "0.5.8.0" # Do not touch unless doing a release, do not backport the version number that's in master
+    number: "0.5.9.0" # Do not touch unless doing a release, do not backport the version number that's in master
   heroku: false
   environment:
     url: "http://localhost:3000/"
diff --git a/config/locales/diaspora/en.yml b/config/locales/diaspora/en.yml
index a74e956fb..36354accd 100644
--- a/config/locales/diaspora/en.yml
+++ b/config/locales/diaspora/en.yml
@@ -838,12 +838,14 @@ en:
       message: |-
         Hello!
 
-        You have been invited to join diaspora*!
+        You have been invited to join diaspora* by %{diaspora_id}!
 
         Click this link to get started
 
         [%{invite_url}][1]
 
+        Or you can add %{diaspora_id} to your contacts if you already have an account.
+
 
         Love,
 
diff --git a/spec/controllers/notifications_controller_spec.rb b/spec/controllers/notifications_controller_spec.rb
index 2e79d431d..c8ef2dc22 100644
--- a/spec/controllers/notifications_controller_spec.rb
+++ b/spec/controllers/notifications_controller_spec.rb
@@ -31,6 +31,19 @@ describe NotificationsController, :type => :controller do
       get :update, "id" => note.id, :set_unread => "true", :format => :json
     end
 
+    it "marks a notification as unread without timestamping" do
+      note = Timecop.travel(1.hour.ago) do
+        FactoryGirl.create(:notification, recipient: alice, unread: false)
+      end
+
+      get :update, "id" => note.id, :set_unread => "true", :format => :json
+      expect(response).to be_success
+
+      updated_note = Notification.find(note.id)
+      expect(updated_note.unread).to eq(true)
+      expect(updated_note.updated_at.iso8601).to eq(note.updated_at.iso8601)
+    end
+
     it 'only lets you read your own notifications' do
       user2 = bob
 
diff --git a/spec/models/notification_spec.rb b/spec/models/notification_spec.rb
index b7bd65f71..34317494b 100644
--- a/spec/models/notification_spec.rb
+++ b/spec/models/notification_spec.rb
@@ -41,15 +41,17 @@ describe Notification, :type => :model do
   describe 'set_read_state method' do
     it "should set an unread notification to read" do
       @note.unread = true
+      @note.save
       @note.set_read_state( true )
       expect(@note.unread).to eq(false)
     end
+
     it "should set an read notification to unread" do
       @note.unread = false
+      @note.save
       @note.set_read_state( false )
       expect(@note.unread).to eq(true)
     end
-
   end