diff --git a/app/javascript/mastodon/features/getting_started/index.js b/app/javascript/mastodon/features/getting_started/index.js
index f8ea0102471..16f71966bb6 100644
--- a/app/javascript/mastodon/features/getting_started/index.js
+++ b/app/javascript/mastodon/features/getting_started/index.js
@@ -96,8 +96,8 @@ export default class GettingStarted extends ImmutablePureComponent {
             <p>
               <FormattedMessage
                 id='getting_started.open_source_notice'
-                defaultMessage='Mastodon is open source software. You can contribute or report issues on GitHub at {github}.'
-                values={{ github: <a href='https://github.com/tootsuite/mastodon' rel='noopener' target='_blank'>tootsuite/mastodon</a> }}
+                defaultMessage='Glitchsoc is open source software, a friendly fork of {Mastodon}. You can contribute or report issues on GitHub at {github}.'
+                values={{ github: <a href='https://github.com/glitch-soc/mastodon' rel='noopener' target='_blank'>glitch-soc/mastodon</a>, Mastodon: <a href='https://github.com/tootsuite/mastodon' rel='noopener' target='_blank'>Mastodon</a>}}
               />
             </p>
           </div>
diff --git a/app/javascript/mastodon/features/ui/components/onboarding_modal.js b/app/javascript/mastodon/features/ui/components/onboarding_modal.js
index d2e02d63b41..1b8d844d3fe 100644
--- a/app/javascript/mastodon/features/ui/components/onboarding_modal.js
+++ b/app/javascript/mastodon/features/ui/components/onboarding_modal.js
@@ -29,8 +29,8 @@ const PageOne = ({ acct, domain }) => (
     </div>
 
     <div>
-      <h1><FormattedMessage id='onboarding.page_one.welcome' defaultMessage='Welcome to Mastodon!' /></h1>
-      <p><FormattedMessage id='onboarding.page_one.federation' defaultMessage='Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.' /></p>
+      <h1><FormattedMessage id='onboarding.page_one.welcome' defaultMessage='Welcome to {domain}!' values={{ domain }} /></h1>
+      <p><FormattedMessage id='onboarding.page_one.federation' defaultMessage='{domain} is an "instance" of Mastodon. Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.' values={{ domain }} /></p>
       <p><FormattedMessage id='onboarding.page_one.handle' defaultMessage='You are on {domain}, so your full handle is {handle}' values={{ domain, handle: <strong>{acct}@{domain}</strong> }} /></p>
     </div>
   </div>
@@ -149,13 +149,14 @@ const PageSix = ({ admin, domain }) => {
     <div className='onboarding-modal__page onboarding-modal__page-six'>
       <h1><FormattedMessage id='onboarding.page_six.almost_done' defaultMessage='Almost done...' /></h1>
       {adminSection}
-      <p><FormattedMessage id='onboarding.page_six.github' defaultMessage='Mastodon is free open-source software. You can report bugs, request features, or contribute to the code on {github}.' values={{ github: <a href='https://github.com/tootsuite/mastodon' target='_blank' rel='noopener'>GitHub</a> }} /></p>
-      <p><FormattedMessage id='onboarding.page_six.apps_available' defaultMessage='There are {apps} available for iOS, Android and other platforms.' values={{ apps: <a href='https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/Apps.md' target='_blank' rel='noopener'><FormattedMessage id='onboarding.page_six.various_app' defaultMessage='mobile apps' /></a> }} /></p>
+      <p><FormattedMessage id='onboarding.page_six.github' defaultMessage='{domain} runs on Glitchsoc. Glitchsoc is a friendly {fork} of {Mastodon}. Glitchsoc is fully compatible with all Mastodon apps and instances. Glitchsoc is free open-source software. You can report bugs, request features, or contribute to the code on {github}.' values={{ domain, fork: <a href='https://en.wikipedia.org/wiki/Fork_(software_development)' target='_blank' rel='noopener'>fork</a>, Mastodon: <a href='https://github.com/tootsuite/mastodon' target='_blank' rel='noopener'>Mastodon</a>, github: <a href='https://github.com/glitch-soc/mastodon' target='_blank' rel='noopener'>GitHub</a> }} /></p>
+      <p><FormattedMessage id='onboarding.page_six.apps_available' defaultMessage='There are {apps} available for iOS, Android and other platforms.' values={{ domain, apps: <a href='https://github.com/tootsuite/documentation/blob/master/Using-Mastodon/Apps.md' target='_blank' rel='noopener'><FormattedMessage id='onboarding.page_six.various_app' defaultMessage='mobile apps' /></a> }} /></p>
       <p><em><FormattedMessage id='onboarding.page_six.appetoot' defaultMessage='Bon Appetoot!' /></em></p>
     </div>
   );
 };
-
+<a href='https://github.com/glitch-soc/mastodon' target='_blank' rel='noopener'>GitHub</a> }} /></p>
+      <p><FormattedMessage id='onboarding.page_six.apps_available' defaultMessage='There are {apps} available for iOS, Android and other platforms.' values={{ apps: <a href='https://github.com/tootsuite/documentation/blob/master/Using-Mast
 PageSix.propTypes = {
   admin: ImmutablePropTypes.map,
   domain: PropTypes.string.isRequired,
diff --git a/app/javascript/mastodon/locales/defaultMessages.json b/app/javascript/mastodon/locales/defaultMessages.json
index 803d9b292ee..45353e9a3bb 100644
--- a/app/javascript/mastodon/locales/defaultMessages.json
+++ b/app/javascript/mastodon/locales/defaultMessages.json
@@ -780,7 +780,7 @@
         "id": "getting_started.appsshort"
       },
       {
-        "defaultMessage": "Mastodon is open source software. You can contribute or report issues on GitHub at {github}.",
+        "defaultMessage": "Glitchsoc is open source software, a friendly fork of {Mastodon}. You can contribute or report issues on GitHub at {github}.",
         "id": "getting_started.open_source_notice"
       }
     ],
@@ -1069,11 +1069,11 @@
         "id": "column.public"
       },
       {
-        "defaultMessage": "Welcome to Mastodon!",
+        "defaultMessage": "Welcome to {domain}!",
         "id": "onboarding.page_one.welcome"
       },
       {
-        "defaultMessage": "Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.",
+        "defaultMessage": "{domain} is an 'instance' of Mastodon. Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.",
         "id": "onboarding.page_one.federation"
       },
       {
@@ -1121,7 +1121,7 @@
         "id": "onboarding.page_six.almost_done"
       },
       {
-        "defaultMessage": "Mastodon is free open-source software. You can report bugs, request features, or contribute to the code on {github}.",
+        "defaultMessage": "{domain} runs on Glitchsoc, a friendly fork of {Mastodon}. Glitchsoc is fully compatible with any Mastodon instance or app. You can report bugs, request features, or contribute to the code on {github}.",
         "id": "onboarding.page_six.github"
       },
       {
diff --git a/app/javascript/mastodon/locales/en.json b/app/javascript/mastodon/locales/en.json
index c19d4aa024c..3b2d198b159 100644
--- a/app/javascript/mastodon/locales/en.json
+++ b/app/javascript/mastodon/locales/en.json
@@ -71,7 +71,7 @@
   "getting_started.appsshort": "Apps",
   "getting_started.faq": "FAQ",
   "getting_started.heading": "Getting started",
-  "getting_started.open_source_notice": "Mastodon is open source software. You can contribute or report issues on GitHub at {github}.",
+  "getting_started.open_source_notice": "Glitchsoc is free open source software forked from {Mastodon}. You can contribute or report issues on GitHub at {github}.",
   "getting_started.userguide": "User Guide",
   "home.column_settings.advanced": "Advanced",
   "home.column_settings.basic": "Basic",
@@ -115,14 +115,14 @@
   "onboarding.page_five.public_timelines": "The local timeline shows public posts from everyone on {domain}. The federated timeline shows public posts from everyone who people on {domain} follow. These are the Public Timelines, a great way to discover new people.",
   "onboarding.page_four.home": "The home timeline shows posts from people you follow.",
   "onboarding.page_four.notifications": "The notifications column shows when someone interacts with you.",
-  "onboarding.page_one.federation": "Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.",
+  "onboarding.page_one.federation": "{domain} is an 'instance' of Mastodon. Mastodon is a network of independent servers joining up to make one larger social network. We call these servers instances.",
   "onboarding.page_one.handle": "You are on {domain}, so your full handle is {handle}",
-  "onboarding.page_one.welcome": "Welcome to Mastodon!",
+  "onboarding.page_one.welcome": "Welcome to {domain}!",
   "onboarding.page_six.admin": "Your instance's admin is {admin}.",
   "onboarding.page_six.almost_done": "Almost done...",
   "onboarding.page_six.appetoot": "Bon Appetoot!",
   "onboarding.page_six.apps_available": "There are {apps} available for iOS, Android and other platforms.",
-  "onboarding.page_six.github": "Mastodon is free open-source software. You can report bugs, request features, or contribute to the code on {github}.",
+  "onboarding.page_six.github": "{domain} runs on Glitchsoc. Glitchsoc is a friendly {fork} of {Mastodon}, and is compatible with any Mastodon instance or app. Glitchsoc is entirely free and open-source. You can report bugs, request features, or contribute to the code on {github}.",
   "onboarding.page_six.guidelines": "community guidelines",
   "onboarding.page_six.read_guidelines": "Please read {domain}'s {guidelines}!",
   "onboarding.page_six.various_app": "mobile apps",