diff --git a/altair/examples/isotype.py b/altair/examples/isotype.py
index 076441195..f5a3ab502 100644
--- a/altair/examples/isotype.py
+++ b/altair/examples/isotype.py
@@ -5,7 +5,7 @@
 Inspired by `Only An Ocean Between, 1943 <http://www.thomwhite.co.uk/?p=1303>`_. Population Live Stock, p.13.
 This is adapted from Vega-Lite example https://vega.github.io/editor/#/examples/vega-lite/isotype_bar_chart
 '''
-# category: case studies
+# category: other charts
 import altair as alt
 import pandas as pd
 
diff --git a/altair/examples/isotype_emoji.py b/altair/examples/isotype_emoji.py
index 3469070ed..a8f143c95 100644
--- a/altair/examples/isotype_emoji.py
+++ b/altair/examples/isotype_emoji.py
@@ -5,7 +5,7 @@
 marks rather than custom SVG paths (see https://altair-viz.github.io/gallery/isotype.html).
 This is adapted from Vega-Lite example https://vega.github.io/vega-lite/examples/isotype_bar_chart_emoji.html.
 '''
-# category: case studies
+# category: other charts
 import altair as alt
 import pandas as pd