diff --git a/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/SessionAclDecisionCacheTests.cs b/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/SessionAclDecisionCacheTests.cs
index 2ab67dce..325f181a 100644
--- a/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/SessionAclDecisionCacheTests.cs
+++ b/tests/Server/ZB.MOM.WW.OtOpcUa.OpcUaServer.Tests/SessionAclDecisionCacheTests.cs
@@ -578,9 +578,9 @@ public sealed class SessionAclDecisionCacheTests(ITestOutputHelper output)
         const int rounds = 10_000;
         const int spinsBeforeYield = 4_000;
 
-        // Array-as-ref-cell: a one-element array is the cheapest storage a lambda can close over AND that
-        // Volatile.Read/Write can take a `ref` to — a captured local cannot be passed by ref, and a plain
-        // field would need the test moved onto the class.
+        // Array-as-ref-cell: the one cell that is re-seated every round (a fresh cache per round), shared
+        // by the starter and both racers. A captured local would also take `ref` (gate/finished below do
+        // exactly that) — the array is a readability choice marking the re-seated slot, not a necessity.
         var slot = new SessionAclDecisionCache[1];
         var gate = 0;      // starter's release signal: the round number both racers are cleared to run
         var finished = 0;  // racers' completion count for the current round