diff --git a/extensions.json b/extensions.json
index 82adebb..976362d 100644
--- a/extensions.json
+++ b/extensions.json
@@ -12,5 +12,6 @@
   "rumble": "https://raw.githubusercontent.com/ManuelLovell/rumble/master/docs/store.md",
   "ticker": "https://www.battle-system.com/owlbear/ticker-docs/store.md",
   "witchdice": "https://witchdice.com/owlbear_ext/store.md",
-  "aoe-shapes": "https://owlbear-aoe.davidsev.co.uk/store.md"
+  "aoe-shapes": "https://owlbear-aoe.davidsev.co.uk/store.md",
+  "pdf-reader": "https://www.battle-system.com/owlbear/pdfd-docs/store.md"
 }