diff --git a/.document b/.document
index 64407a37b7..8b4938f8a1 100644
--- a/.document
+++ b/.document
@@ -10,18 +10,19 @@
 # prelude
 prelude.rb
 rbconfig.rb
+
 array.rb
 ast.rb
 dir.rb
 gc.rb
-numeric.rb
 io.rb
 kernel.rb
+numeric.rb
 pack.rb
+ractor.rb
 timev.rb
 trace_point.rb
 warning.rb
-ractor.rb
 
 # the lib/ directory (which has its own .document file)
 lib