diff --git a/src/compiler-debugging.md b/src/compiler-debugging.md
index 80cbf673..4b445c92 100644
--- a/src/compiler-debugging.md
+++ b/src/compiler-debugging.md
@@ -3,6 +3,10 @@ layout: default
 title: Debugging the Compiler
 ---
 
+**Note: This is copied from the 
+[rust-forge](https://github.com/rust-lang-nursery/rust-forge). If anything needs
+ updating, please open an issue or make a PR on the github repo.**
+
 # Debugging the compiler
 [debugging]: #debugging