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-rw-r--r--docs/specification.rst6
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diff --git a/docs/specification.rst b/docs/specification.rst
index e270d8a6f5..0a421e9e38 100644
--- a/docs/specification.rst
+++ b/docs/specification.rst
@@ -1664,6 +1664,12 @@ Rejecting a presence invite::
 
   Content keys - as for m.presence_invite
 
+.. TODO-doc
+  - Explain the timing-based roundtrip reduction mechanism for presence
+    messages
+  - Explain the zero-byte presence inference logic
+  See also: docs/client-server/model/presence
+
 
 Voice over IP
 =============