Docs: clarify Matrix pairing reminders

docs/channels/matrix.md

@@ -372,6 +372,10 @@ openclaw pairing list matrix
 openclaw pairing approve matrix <CODE>
 ```
 
+If an unapproved Matrix user keeps messaging you before approval, OpenClaw reuses the same pending pairing code and may send a reminder reply again after a short cooldown instead of minting a new code.
+
+See [Pairing](/channels/pairing) for the shared DM pairing flow and storage layout.
+
 ## Multi-account example
 
 ```json5

docs/channels/pairing.md

@@ -27,6 +27,7 @@ Pairing codes:
 
 - 8 characters, uppercase, no ambiguous chars (`0O1I`).
 - **Expire after 1 hour**. The bot only sends the pairing message when a new request is created (roughly once per hour per sender).
+- Some channels may also send reminder replies for still-pending requests. Matrix reuses the same code and can send a reminder again after a short cooldown if the sender keeps messaging before approval.
 - Pending DM pairing requests are capped at **3 per channel** by default; additional requests are ignored until one expires or is approved.
 
 ### Approve a sender