diff --git a/web/src/RouteMode.svelte b/web/src/RouteMode.svelte
index c35febc..8b633b1 100644
--- a/web/src/RouteMode.svelte
+++ b/web/src/RouteMode.svelte
@@ -111,7 +111,9 @@
     {#if err}
       <p>{err}</p>
     {:else if gj}
-      <button on:click={debugRoute}>Watch how this route was found</button>
+      <button on:click={debugRoute} disabled={$travelMode != "transit"}
+        >Watch how this route was found (PT only)</button
+      >
 
       <ol>
         {#each gj.features as f}