diff --git a/index.js b/index.js
index 7661e16..35255e0 100644
--- a/index.js
+++ b/index.js
@@ -72,10 +72,12 @@ function lint(input, config, webpack, callback) {
       if (emitter) {
         emitter(messages)
         if (config.failOnError && res.errorCount) {
-          throw new Error("Module failed because of a eslint error.")
+          throw new Error("Module failed because of a eslint error.\n"
+            + messages)
         }
         else if (config.failOnWarning && res.warningCount) {
-          throw new Error("Module failed because of a eslint warning.")
+          throw new Error("Module failed because of a eslint warning.\n"
+            + messages)
         }
       }
       else {