diff --git a/ractor.rb b/ractor.rb
index 9f784a7111..ba9cfe14f3 100644
--- a/ractor.rb
+++ b/ractor.rb
@@ -731,6 +731,7 @@ class Ractor
   end
 
   class RemoteError
+    # The Ractor an uncaught exception is raised in.
     attr_reader :ractor
   end