diff --git a/general/prog/docutils.xml b/general/prog/docutils.xml
index eb87673330..c9e13d3b31 100644
--- a/general/prog/docutils.xml
+++ b/general/prog/docutils.xml
@@ -103,6 +103,26 @@ for f in /usr/bin/rst*.py; do
   ln -svf $(basename $f) /usr/bin/$(basename $f .py)
 done</userinput></screen>
 
+      <!-- FHS 3.0 section 4.4.2:
+           "There must be no subdirectories in /usr/bin."
+           But pip maintainers closed this as WONTFIX:
+           https://github.com/pypa/pip/issues/6906 -->
+      <para>
+        To reduce the time needed for loading Python scripts,
+        <command>pip3 install</command> will compile the scripts with
+        extension <filename class='extension'>.py</filename> into byte code
+        and save the result into
+        <filename class='extension'>.pyc</filename> files in the directory
+        <filename class='directory'>__pycache__</filename>.
+        But this package installs <filename class='extension'>.py</filename>
+        scripts into <filename class='directory'>/usr/bin</filename>.
+        So the byte code files for them will be installed into
+        <filename class='directory'>/usr/bin/__pycache__</filename>, which
+        is not allowed by FHS.  Still as the &root; user, remove this
+        directory:
+      </para>
+
+<screen role="root"><userinput>rm -rfv /usr/bin/__pycache__</userinput></screen>
     </sect3>
 
     <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"