diff --git a/buildbot_nix/__init__.py b/buildbot_nix/__init__.py
index 5552b91..456bf65 100644
--- a/buildbot_nix/__init__.py
+++ b/buildbot_nix/__init__.py
@@ -71,6 +71,7 @@ class BuildTrigger(steps.BuildStep):
         self._result_list = []
         self.ended = False
         self.waitForFinishDeferred = None
+        self.description = f"building {len(jobs)} hydra jobs"
         super().__init__(**kwargs)
 
     def interrupt(self, reason):