diff --git a/site/content/docs/03-run-time.md b/site/content/docs/03-run-time.md
index 9067417bc1..77917de412 100644
--- a/site/content/docs/03-run-time.md
+++ b/site/content/docs/03-run-time.md
@@ -659,7 +659,7 @@ Slides an element in and out.
 * `delay` (`number`, default 0) — milliseconds before starting
 * `duration` (`number`, default 400) — milliseconds the transition lasts
 * `easing` (`function`, default `cubicOut`) — an [easing function](docs#svelte_easing)
-* `direction` (`string`, default `vertical`) — direction of transition, vertical or horizontal
+* `direction` (`string`, default `vertical`) — direction of transition, `"vertical"` or `"horizontal"`
 
 ```sv
 <script>