diff --git a/grafana/dashboard.py b/grafana/dashboard.py
index c68d7c9..86910eb 100644
--- a/grafana/dashboard.py
+++ b/grafana/dashboard.py
@@ -195,10 +195,10 @@ ts("DeadAir on a file", [prom('max(ipx_deadair_busy_seconds{job="ipx"})', legend
    desc="How long DeadAir has been on the file it is analysing; a few seconds each.")
 ts("Artwork", [prom('max(ipx_art_cache_bytes{job="ipx"}) / max(ipx_art_cache_limit_bytes{job="ipx"})', legend="full"),
                prom('sum(increase(ipx_art_requests_total{job="ipx", result="hit"}[$__rate_interval])) / '
-                    'sum(increase(ipx_art_requests_total{job="ipx"}[$__rate_interval]))', ref="B", legend="served from disk"),
+                    'sum(increase(ipx_art_requests_total{job="ipx"}[$__rate_interval]))', ref="B", legend="hit rate"),
                prom('sum(increase(ipx_art_evicted_total{job="ipx"}[$__rate_interval]))', ref="C", legend="images evicted")],
    12, w=12, unit="percentunit",
-   desc="Full sits near 100% once the cache has filled, since each sweep trims it to fit. Served from disk is the hit rate: "
+   desc="Full sits near 100% once the cache has filled, since each sweep trims it to fit. Hit rate is the share served from disk: "
         "the rest was fetched from the publisher. Evicted, on the right, is images each sweep threw out to stay under the "
         "limit: many at every sweep, with a falling hit rate, means the limit is too small.")["fieldConfig"]["overrides"] = [
     {"matcher": {"id": "byName", "options": "images evicted"},