diff --git a/spec/22/speakers.yaml b/spec/22/speakers.yaml
index 5d06da6..7e38f66 100644
--- a/spec/22/speakers.yaml
+++ b/spec/22/speakers.yaml
@@ -115,6 +115,7 @@
 - id: petr-klein
   name: Petr Klein
   twitter: kleinptr
+  mastodon: '@kleinptr@mastodon.social'
   bio: Libertarián, nadšenec do nových technologií
   orgs: |
     Člen [Gwei.cz Councilu](https://gwei.cz), člen [Border Hackerspace](https://bordel.paralelnipolis.cz/#/), APUS Finance
diff --git a/utils/schema/1/speaker.yaml b/utils/schema/1/speaker.yaml
index 4567a2d..2a89dff 100644
--- a/utils/schema/1/speaker.yaml
+++ b/utils/schema/1/speaker.yaml
@@ -23,6 +23,9 @@ properties:
     type: string
     pattern: "^[a-zA-Z0-9-]+$"
     title: LinkedIn uživatelské jméno
+  mastodon:
+    type: string
+    title: Mastodon uživatelské jméno
   orgs:
     type: string
     title: Organizace (Markdown)