diff --git a/src/doc/src/reference/unstable.md b/src/doc/src/reference/unstable.md
index e5ea77e29c4..c63d21fba37 100644
--- a/src/doc/src/reference/unstable.md
+++ b/src/doc/src/reference/unstable.md
@@ -12,9 +12,9 @@ config file (`.cargo/config.toml`) in the `unstable` table. For example:
 
 ```toml
 [unstable]
-mtime-on-use = 'yes'
-multitarget = 'yes'
-timings = 'yes'
+mtime-on-use = true
+multitarget = true
+timings = ["html"]
 ```
 
 Some unstable features will require you to specify the `cargo-features` key in