diff --git a/extensions.json b/extensions.json
index f5bbf57..3d2c422 100644
--- a/extensions.json
+++ b/extensions.json
@@ -39,5 +39,6 @@
   "calendar": "https://www.battle-system.com/owlbear/calendar-docs/store.md",
   "bones": "https://www.battle-system.com/owlbear/bones-docs/store.md",
   "pretty-sordid": "https://raw.githubusercontent.com/SeamusFinlayson/initiative-tracker/main/docs/store.md",
-  "owl-trackers": "https://raw.githubusercontent.com/SeamusFinlayson/owl-trackers/main/docs/store.md"
+  "owl-trackers": "https://raw.githubusercontent.com/SeamusFinlayson/owl-trackers/main/docs/store.md",
+  "calendar-of-harptos": "https://resident-uhlig.gitlab.io/owlbear-rodeo-calendar-of-harptos/store/index.md"
 }