diff -r 3f808549d426 -r de9424647fe4 mercurial/minirst.py
--- a/mercurial/minirst.py	Mon Oct 06 07:29:38 2014 -0400
+++ b/mercurial/minirst.py	Mon Oct 06 07:35:53 2014 -0400
@@ -654,9 +654,18 @@
     if section:
         sections = getsections(blocks)
         blocks = []
-        for name, nest, b in sections:
+        i = 0
+        while i < len(sections):
+            name, nest, b = sections[i]
             if name == section:
-                blocks = b
+                blocks.extend(b)
+
+                ## Also show all subnested sections
+                while i + 1 < len(sections) and sections[i + 1][1] > nest:
+                    i += 1
+                    blocks.extend(sections[i][2])
+            i += 1
+
     if style == 'html':
         text = formathtml(blocks)
     else: