diff --git a/server/server.go b/server/server.go
index d5787ca..77cb95c 100644
--- a/server/server.go
+++ b/server/server.go
@@ -154,6 +154,7 @@ func (s *Server) PerformMessageQuery(query *MessagesQuery) []model.Message {
 	})
 
 	// Apply before/after filters
+	// The following code assumes the messages are sorted by date ascending
 	if query.BeforeGUID != nil {
 		beforeGUID := *query.BeforeGUID
 		for i := range messages {