diff --git a/app/views/cards/display/common/_assignees.html.erb b/app/views/cards/display/common/_assignees.html.erb
index 614a976e0..58a010bbb 100644
--- a/app/views/cards/display/common/_assignees.html.erb
+++ b/app/views/cards/display/common/_assignees.html.erb
@@ -4,7 +4,7 @@
   <% end %>
 
   <div class="position-relative" data-controller="dialog" data-action="keydown.esc->dialog#close click@document->dialog#closeOnClickOutside" <%= "hidden" if card.closed? %>>
-    <button class="btn card__hide-on-index" data-action="click->dialog#open:stop" style="--btn-background: var(--card-bg-color);">
+    <button class="btn card__hide-on-index tooltip" data-action="click->dialog#open:stop" style="--btn-background: var(--card-bg-color);">
       <%= icon_tag "person-add" %>
       <span class="for-screen-reader">Assign</span>
     </button>