diff --git a/fosdem_video_progress.py b/fosdem_video_progress.py
index 51e1394..ceed713 100755
--- a/fosdem_video_progress.py
+++ b/fosdem_video_progress.py
@@ -65,6 +65,7 @@ def main():
 		# ys are transposed – we need vectors by times, not by states.
 		ys = list(zip(*ys))
 		plt.stackplot(x, ys, labels=states)
+		plt.legend(loc='upper left')
 		print('showing plot')
 		plt.show(block=False)