diff --git a/internal/caching/caches.go b/internal/caching/caches.go
index 9cbb7c622..f4bbea789 100644
--- a/internal/caching/caches.go
+++ b/internal/caching/caches.go
@@ -33,7 +33,7 @@ type Caches struct {
 	RoomServerStateKeyNIDs  Cache[string, types.EventStateKeyNID]                  // event state key -> eventStateKey NID
 	RoomServerEventTypeNIDs Cache[string, types.EventTypeNID]                      // eventType -> eventType NID
 	RoomServerEventTypes    Cache[types.EventTypeNID, string]                      // eventType NID -> eventType
-	FederationPDUs          Cache[int64, *types.HeaderedEvent]         // queue NID -> PDU
+	FederationPDUs          Cache[int64, *types.HeaderedEvent]                     // queue NID -> PDU
 	FederationEDUs          Cache[int64, *gomatrixserverlib.EDU]                   // queue NID -> EDU
 	SpaceSummaryRooms       Cache[string, fclient.MSC2946SpacesResponse]           // room ID -> space response
 	LazyLoading             Cache[lazyLoadingCacheKey, string]                     // composite key -> event ID