diff --git a/src/bootstrap/config.toml.example b/src/bootstrap/config.toml.example
index 2894adafef6..9e8910669a0 100644
--- a/src/bootstrap/config.toml.example
+++ b/src/bootstrap/config.toml.example
@@ -1,5 +1,7 @@
 # Sample TOML configuration file for building Rust.
 #
+# To configure rustbuild, copy this file to ../config.toml.
+#
 # All options are commented out by default in this file, and they're commented
 # out with their default values. The build system by default looks for
 # `config.toml` in the current directory of a build for build configuration, but