diff --git a/lib/finalize.rb b/lib/finalize.rb
index 4a9d877edc..9b6b302cac 100644
--- a/lib/finalize.rb
+++ b/lib/finalize.rb
@@ -8,43 +8,43 @@
 #
 # Usage:
 #
-#	add dependency R_method(obj, dependant)
+# add dependency R_method(obj, dependant)
 #   add(obj, dependant, method = :finalize, *opt)
 #   add_dependency(obj, dependant, method = :finalize, *opt)
 #
-#	delete dependency R_method(obj, dependant)
+# delete dependency R_method(obj, dependant)
 #   delete(obj_or_id, dependant, method = :finalize)
 #   delete_dependency(obj_or_id, dependant, method = :finalize)
 #
-#	delete dependency R_*(obj, dependant)
+# delete dependency R_*(obj, dependant)
 #   delete_all_dependency(obj_or_id, dependant)
 #
-#	delete dependency R_method(*, dependant)
+# delete dependency R_method(*, dependant)
 #   delete_by_dependant(dependant, method = :finalize)
 #
-#	delete dependency R_*(*, dependant)
+# delete dependency R_*(*, dependant)
 #   delete_all_by_dependant(dependant)
 #
-#	delete all dependency R_*(*, *)
+# delete all dependency R_*(*, *)
 #   delete_all
 #
-#	finalize the dependant connected by dependency R_method(obj, dependtant).
+# finalize the dependant connected by dependency R_method(obj, dependtant).
 #   finalize(obj_or_id, dependant, method = :finalize)
 #   finalize_dependency(obj_or_id, dependant, method = :finalize)
 #
-#	finalize all dependants connected by dependency R_*(obj, dependtant).
+# finalize all dependants connected by dependency R_*(obj, dependtant).
 #   finalize_all_dependency(obj_or_id, dependant)
 #
-#	finalize the dependant connected by dependency R_method(*, dependtant).
+# finalize the dependant connected by dependency R_method(*, dependtant).
 #   finalize_by_dependant(dependant, method = :finalize)
 #
-#	finalize all dependants connected by dependency R_*(*, dependant).
+# finalize all dependants connected by dependency R_*(*, dependant).
 #   finalize_all_by_dependant(dependant)
 #
-#	finalize all dependency registered to the Finalizer.
+# finalize all dependency registered to the Finalizer.
 #   finalize_all
 #
-#	stop invoking Finalizer on GC.
+# stop invoking Finalizer on GC.
 #   safe{..}
 #