diff --git a/704.md b/704.md
index 7d31600..f2a91e9 100644
--- a/704.md
+++ b/704.md
@@ -63,7 +63,7 @@ If `Alice` wants to signal `Bob` that she is ready to use this NIP (for more pri
  - build a JSON data of the form:
 ```json
  {
-  "key": <the direct message parent key>,
+  "key": <the direct message parent key (dmpk)>,
   "send_index": <integer (optional), the index of the last key used to sign an event>,
   "receive_index": <integer (optional), the index of the last key an event was received to>,
  }