diff --git a/changelog.d/17531.misc b/changelog.d/17531.misc
new file mode 100644
index 000000000..25b7b36a7
--- /dev/null
+++ b/changelog.d/17531.misc
@@ -0,0 +1 @@
+Fixup comment in sliding sync implementation.
diff --git a/synapse/api/errors.py b/synapse/api/errors.py
index 99fc7eab5..e6efa7a42 100644
--- a/synapse/api/errors.py
+++ b/synapse/api/errors.py
@@ -128,7 +128,7 @@ class Codes(str, Enum):
     # MSC2677
     DUPLICATE_ANNOTATION = "M_DUPLICATE_ANNOTATION"
 
-    # MSC3575 we are telling the client they need to reset their sliding sync
+    # MSC3575 we are telling the client they need to expire their sliding sync
     # connection.
     UNKNOWN_POS = "M_UNKNOWN_POS"