diff --git a/changelogs/server_server/newsfragments/1536.clarification b/changelogs/server_server/newsfragments/1536.clarification
new file mode 100644
index 00000000..717dc43f
--- /dev/null
+++ b/changelogs/server_server/newsfragments/1536.clarification
@@ -0,0 +1 @@
+Remove extraneous `age_ts` field from the reference hash calculation section.
\ No newline at end of file
diff --git a/content/server-server-api.md b/content/server-server-api.md
index fabe7820..b8c78345 100644
--- a/content/server-server-api.md
+++ b/content/server-server-api.md
@@ -1270,7 +1270,7 @@ specification](/rooms) for more information. It is
 calculated as follows.
 
 1.  The event is put through the redaction algorithm.
-2.  The `signatures`, `age_ts`, and `unsigned` properties are removed
+2.  The `signatures` and `unsigned` properties are removed
     from the event, if present.
 3.  The event is converted into [Canonical
     JSON](/appendices#canonical-json).