diff --git a/src/doc/rustc/src/command-line-arguments.md b/src/doc/rustc/src/command-line-arguments.md
index d7e789b5a11..18d7052c2c5 100644
--- a/src/doc/rustc/src/command-line-arguments.md
+++ b/src/doc/rustc/src/command-line-arguments.md
@@ -86,6 +86,12 @@ This flag will set which lints should be set to the [deny level](lints/levels.ht
 
 This flag will set which lints should be set to the [forbid level](lints/levels.html#forbid).
 
+## `-Z`: set options for debugging rustc
+
+This flag lets you set options for debugging rustc. In order to set multiple options, the -Z flag
+can be used multiple times. For example: `rustc -Z verbose -Z time`. Specifying options with -Z is
+only available on nightly. To view all available options run: `rustc -Z help`.
+
 ## `--cap-lints`: set the most restrictive lint level
 
 This flag lets you 'cap' lints, for more, [see here](lints/levels.html#capping-lints).