diff --git a/tensorboard/webapp/runs/views/runs_table/runs_table_component.ng.html b/tensorboard/webapp/runs/views/runs_table/runs_table_component.ng.html
index 936c18cf67d..b88e9a29c4e 100644
--- a/tensorboard/webapp/runs/views/runs_table/runs_table_component.ng.html
+++ b/tensorboard/webapp/runs/views/runs_table/runs_table_component.ng.html
@@ -239,6 +239,7 @@
             [checked]="item.selected"
             (change)="onSelectionToggle.emit(item)"
             (dblclick)="onSelectionDblClick.emit(item)"
+            title="Click to toggle run selection or double click to select only this run."
           ></mat-checkbox>
         </span>
         <tb-experiment-alias