diff --git a/src/routes/_components/Tooltip.html b/src/routes/_components/Tooltip.html
index 72cb3337..b2e4fa8b 100644
--- a/src/routes/_components/Tooltip.html
+++ b/src/routes/_components/Tooltip.html
@@ -3,6 +3,8 @@
 -->
 <span class="tooltip-button"
       aria-describedby="tooltip-{id}"
+      aria-expanded={shown}
+      aria-controls="tooltip-{id}"
       role="button"
       tabindex="0"
       on:mouseover="set({shown: true, mouseover: true})"