diff --git a/pre_commit/commands/run.py b/pre_commit/commands/run.py
index d060e186..6c191fac 100644
--- a/pre_commit/commands/run.py
+++ b/pre_commit/commands/run.py
@@ -152,7 +152,9 @@ def _run_single_hook(classifier, hook, args, skips, cols):
 
         # Print a message if failing due to file modifications
         if file_modifications:
-            output.write('Files were modified by this hook.')
+            output.write('Files were modified by this hook.' \
+                         'Please review them in Git\'s staging area, ' \
+                         'and repeat the commit.')
 
             if stdout or stderr:
                 output.write_line(' Additional output:')