diff --git a/stories/crystal-lake-mercury.stories.mdx b/stories/crystal-lake-mercury.stories.mdx
index 03a58e157..1c8463c35 100644
--- a/stories/crystal-lake-mercury.stories.mdx
+++ b/stories/crystal-lake-mercury.stories.mdx
@@ -92,7 +92,7 @@ taxonomy:
     <Chart
       dataPath={new URL('./smoke_count_annual_with_trend.csv', import.meta.url).href}
       dateFormat="%Y"
-      idKey='Source'
+      idKey='source'
       xKey='Year'
       yKey='smoke'
       yAxisLabel='Smoke Count (Annual)'