diff --git a/Makefile.in b/Makefile.in
index d3bb5a541a4..1fe96189632 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -62,6 +62,7 @@
 #   * tidy-basic - show file / line stats
 #   * tidy-errors - show the highest rustc error code
 #   * tidy-features - show the status of language and lib features
+#   * rustc-stage$(stage) - Only build up to a specific stage
 #
 # Then mix in some of these environment variables to harness the
 # ultimate power of The Rust Build System.