diff --git a/trailer.html b/trailer.html
index 677470a..aeae94a 100644
--- a/trailer.html
+++ b/trailer.html
@@ -1220,7 +1220,12 @@
     }
     if ((el = hit("data-revise"))) {
       el.disabled = true;
-      r = await act("start_revision", { run_id: runId }); if (r) await refresh(); return;
+      r = await act("start_revision", { run_id: runId });
+      // Say so. Pressing this used to change nothing on screen for several
+      // seconds, which reads as a button that does not work.
+      if (r) { showMsg("msg", "The head writer is rewriting the script with your notes. "
+        + "It takes a few minutes and appears as a new tab.", "ok"); await refresh(); }
+      return;
     }
     if ((el = hit("data-film"))) {
       el.disabled = true;