diff --git a/config/environments/development.js.example b/config/environments/development.js.example
index 91cf2a39..d58c8a97 100644
--- a/config/environments/development.js.example
+++ b/config/environments/development.js.example
@@ -55,7 +55,7 @@ var config = {
     ,socket_timeout: 600000
     ,enable_cors: true
     ,cache_enabled: false
-    ,log_format: ':req[X-Real-IP] :method :req[Host]:url :status :response-time ms -> :res[Content-Type] (:res[X-Tiler-Profiler])'
+    ,log_format: ':req[X-Real-IP] :method :req[Host]:url :status :response-time ms -> :res[Content-Type] (:res[X-Tiler-Profiler]) !!!:res[X-Tiler-Errors]'
     // If log_filename is given logs will be written
     // there, in append mode. Otherwise stdout is used (default).
     // Log file will be re-opened on receiving the HUP signal