diff --git a/relay-server/src/services/project_cache.rs b/relay-server/src/services/project_cache.rs
index 6c507e5f18..d2b02197f9 100644
--- a/relay-server/src/services/project_cache.rs
+++ b/relay-server/src/services/project_cache.rs
@@ -1326,6 +1326,7 @@ pub struct ProjectCacheService {
     memory_checker: MemoryChecker,
     services: Services,
     global_config_rx: watch::Receiver<global_config::Status>,
+    /// Bounded channel used exclusively to receive envelopes from the envelope buffer.
     envelopes_rx: mpsc::Receiver<DequeuedEnvelope>,
     redis: Option<RedisPool>,
 }