diff --git a/init.el b/init.el
index 713a355..4482efa 100644
--- a/init.el
+++ b/init.el
@@ -87,6 +87,9 @@ by Prelude.")
 ;; each 50MB of allocated data (the default is on every 0.76MB)
 (setq gc-cons-threshold 50000000)
 
+;; warn when opening files bigger than 100MB
+(setq large-file-warning-threshold 100000000)
+
 ;; preload the personal settings from `prelude-personal-preload-dir'
 (when (file-exists-p prelude-personal-preload-dir)
   (message "Loading personal configuration files in %s..." prelude-personal-preload-dir)