diff --git a/src/building/compiler-documenting.md b/src/building/compiler-documenting.md
index 9ed5c262b8429..202923b68a4be 100644
--- a/src/building/compiler-documenting.md
+++ b/src/building/compiler-documenting.md
@@ -35,7 +35,7 @@ like the standard library (std) or the compiler (rustc).
 - Document internal rustc items
 
   Compiler documentation is not built by default.
-  To enable it, modify `config.toml`:
+  To create it by default with `x.py doc`, modify `config.toml`:
 
   ```toml
   [build]