diff --git a/InternalDocs/README.md b/InternalDocs/README.md
index 06f67b3cfc124a..80744f30a5b591 100644
--- a/InternalDocs/README.md
+++ b/InternalDocs/README.md
@@ -29,8 +29,6 @@ Runtime Objects
 
 - [Frames](frames.md)
 
-- [String Interning](string_interning.md)
-
 Program Execution
 ---
 
@@ -48,6 +46,14 @@ Program Execution
 
 - [Stack protection](stack_protection.md)
 
+Built-in Types
+---
+
+- [String Interning](string_interning.md)
+
+- [List sort algorithm](../Objects/listsort.txt)
+  <!-- (kept at the original location outside this directory) -->
+
 Modules
 ---