diff --git a/46.md b/46.md
index 53185416..8647e940 100644
--- a/46.md
+++ b/46.md
@@ -66,7 +66,9 @@ These are mandatory methods the remote signer app MUST implement:
   - params []
   - result `pubkey` 
 - **sign_event**
-  - params [`event`]
+  - params [`event`, `options`]
+  - options
+    - `pow` minimum proof-of-work difficulty
   - result `event_with_signature` 
 
 #### optional