diff --git a/server/routes/types.go b/server/routes/types.go
index 6569b74..0e2a9c6 100644
--- a/server/routes/types.go
+++ b/server/routes/types.go
@@ -23,6 +23,7 @@ func RenderWithContentType[T any](w http.ResponseWriter, r *http.Request, conten
 	}
 
 	// Set strong ETag
+	// NOTE: the ngx_brotli nginx module appears to weaken strong ETags (even though gzipping is fine)
 	w.Header().Set("ETag", `"`+etag+`"`)
 
 	// As a default, set Cache-Control to no-cache, which allows revalidation via ETag