--- a/rust/src/params.rs	Fri Apr 19 13:57:40 2019 +0800
+++ b/rust/src/params.rs	Fri Apr 19 13:58:30 2019 +0800
@@ -123,7 +123,9 @@
                 Err(TemplogError::new(&format!("Bad epoch from server '{}' expected '{}'", *le, self.epoch)))
             }
             hyper::StatusCode::NotModified => {
-                // XXX this isn't really an error
+                // XXX this isn't really an error. Should handle_response() return 
+                // Result<Option<Params>, TemplogError> instead?
+
                 Err(TemplogError::new("304 unmodified (long polling timeout at the server)"))
             },
             _ => {