From a0ce6003fcf93491a95fd453d6857666af0f36c3 Mon Sep 17 00:00:00 2001
From: Neil Alexander <neilalexander@users.noreply.github.com>
Date: Thu, 16 Apr 2020 17:57:39 +0100
Subject: [PATCH] Return bad limit in error

---
 federationapi/routing/backfill.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/federationapi/routing/backfill.go b/federationapi/routing/backfill.go
index 69addcce6..62471b8a9 100644
--- a/federationapi/routing/backfill.go
+++ b/federationapi/routing/backfill.go
@@ -16,6 +16,7 @@ package routing
 
 import (
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"strconv"
 	"time"
@@ -75,7 +76,7 @@ func Backfill(
 		util.GetLogger(httpReq.Context()).WithError(err).Error("strconv.Atoi failed")
 		return util.JSONResponse{
 			Code: http.StatusBadRequest,
-			JSON: jsonerror.InvalidArgumentValue("limit is invalid format"),
+			JSON: jsonerror.InvalidArgumentValue(fmt.Sprintf("limit %q is invalid format", limit)),
 		}
 	}