From f8ce49cc49d85f0366f2e0d32466afade04b0505 Mon Sep 17 00:00:00 2001
From: Ivan Enderlin <ivan@mnt.io>
Date: Wed, 8 Mar 2023 08:51:21 +0100
Subject: [PATCH] chore: Add documentation.

---
 crates/matrix-sdk/src/sliding_sync/mod.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crates/matrix-sdk/src/sliding_sync/mod.rs b/crates/matrix-sdk/src/sliding_sync/mod.rs
index 4e8dac87e..0f3bee748 100644
--- a/crates/matrix-sdk/src/sliding_sync/mod.rs
+++ b/crates/matrix-sdk/src/sliding_sync/mod.rs
@@ -1059,6 +1059,8 @@ impl SlidingSync {
             assign!(v4::Request::new(), {
                 pos,
                 delta_token,
+                // We want to track whether the incoming response maps to this
+                // request. We use the (optional) `txn_id` field for that.
                 txn_id: Some(stream_id.to_owned()),
                 timeout: Some(timeout),
                 lists,