diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 0bbb98b4f5..f966c8f455 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -5055,6 +5055,7 @@ RMarkdown:
   codemirror_mode: gfm
   codemirror_mime_type: text/x-gfm
   extensions:
+  - ".qmd"
   - ".rmd"
   tm_scope: source.gfm
   language_id: 313
diff --git a/samples/RMarkdown/example.qmd b/samples/RMarkdown/example.qmd
new file mode 100644
index 0000000000..489f62bb70
--- /dev/null
+++ b/samples/RMarkdown/example.qmd
@@ -0,0 +1,27 @@
+---
+title: "matplotlib demo"
+format:
+  html:
+    code-fold: true
+jupyter: python3
+---
+
+For a demonstration of a line plot on a polar axis, see @fig-polar.
+
+```{python}
+#| label: fig-polar
+#| fig-cap: "A line plot on a polar axis"
+
+import numpy as np
+import matplotlib.pyplot as plt
+
+r = np.arange(0, 2, 0.01)
+theta = 2 * np.pi * r
+fig, ax = plt.subplots(
+  subplot_kw = {'projection': 'polar'} 
+)
+ax.plot(theta, r)
+ax.set_rticks([0.5, 1, 1.5, 2])
+ax.grid(True)
+plt.show()
+```