diff --git a/src/building/how-to-build-and-run.md b/src/building/how-to-build-and-run.md
index f2f87e1d6..364a307d3 100644
--- a/src/building/how-to-build-and-run.md
+++ b/src/building/how-to-build-and-run.md
@@ -57,16 +57,8 @@ assertions = true
 #
 debug = true
 
-# Number of codegen units to use for each compiler invocation. A value of 0
-# means "the number of cores on this machine", and 1+ is passed through to the
-# compiler.
-codegen-units = 0
-
 # Whether to always use incremental compilation when building rustc
 incremental = true
-
-# Emits extra output from tests so test failures are debuggable just from logfiles.
-verbose-tests = true
 ```
 
 If you have already built `rustc`, then you may have to execute `rm -rf build` for subsequent