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-rw-r--r--railties/lib/rails/generators/migration.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/railties/lib/rails/generators/migration.rb b/railties/lib/rails/generators/migration.rb
index 5bf98bb6e0..cd69a017dd 100644
--- a/railties/lib/rails/generators/migration.rb
+++ b/railties/lib/rails/generators/migration.rb
@@ -52,7 +52,7 @@ module Rails
if destination && options.force?
remove_file(destination)
elsif destination
- raise Error, "Another migration is already named #{@migration_file_name}: #{destination}"
+ raise Error, "Another migration is already named #{@migration_file_name}: #{destination}. Use --force to remove the old migration file and replace it."
end
destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb")
end