diff --git a/.claude/skills/graphics/tasks/trend.md b/.claude/skills/graphics/tasks/trend.md
index f4bf669..fe2903a 100644
--- a/.claude/skills/graphics/tasks/trend.md
+++ b/.claude/skills/graphics/tasks/trend.md
@@ -131,5 +131,8 @@ rotation, zoom. Outputs (⇨): *Hairline value[n]*, *Time range begin/end*, *Upd
   `<property type="componentProperty"><name>itemName[0]</name><value>…</value></property>`,
   `scaleMin[n]`, `scaleMax[n]`; elements `numberOfPens`, `realTime`, `fillWithHistory`,
   `timeRange` (s, default 300), `sampleCount` (default 300)): drew on desktop and web the first
-  time, then stayed blank on several later opens and later drew again; after an in-page reload
-  sometimes only part of a pen shows (intermittent, ISS-055, open).
+  time, then stayed blank on several later opens (ISS-055). Cause: *Number of pens* resets all
+  pen sources, so fixed item names can be lost during load. **Connect** `microTrend.itemName[n]`
+  to the item with attribute `ItemName` instead (`<action type="actionConnectTo">`, `<direction>1`,
+  `<itemAttribute>ItemName`; sample `CIENG_TrendLab`): both pens then drew on every open; the
+  history fill still failed once in three opens (only the live part drew; ISS-055 open).