diff --git a/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md b/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md
deleted file mode 100644
index 251fc720912..00000000000
--- a/src/doc/unstable-book/src/language-features/macro-at-most-once-rep.md
+++ /dev/null
@@ -1,22 +0,0 @@
-# `macro_at_most_once_rep`
-
-NOTE: This feature is only available in the 2018 Edition.
-
-The tracking issue for this feature is: #48075
-
-With this feature gate enabled, one can use `?` as a Kleene operator meaning "0
-or 1 repetitions" in a macro definition. Previously only `+` and `*` were allowed.
-
-For example:
-
-```rust,ignore
-#![feature(macro_at_most_once_rep)]
-
-macro_rules! foo {
-    (something $(,)?) // `?` indicates `,` is "optional"...
-        => {}
-}
-```
-
-------------------------
-