diff --git a/doc/conf.py b/doc/conf.py
index 00f2413..5e2ff1c 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -39,7 +39,7 @@
 extensions = ['kerneldoc', 'rstFlatTable', 'kernel_include',
               'kfigure', 'sphinx.ext.ifconfig', # 'automarkup',
               'maintainers_include', 'sphinx.ext.autosectionlabel',
-              'kernel_abi', 'kernel_feat']
+              'kernel_abi', 'kernel_feat', 'sphinx-prompt']
 
 #
 # cdomain is badly broken in Sphinx 3+.  Leaving it out generates *most*
diff --git a/doc/sphinx/requirements.txt b/doc/sphinx/requirements.txt
index 4f411f7..6ccbe52 100644
--- a/doc/sphinx/requirements.txt
+++ b/doc/sphinx/requirements.txt
@@ -15,6 +15,7 @@
 six==1.16.0
 snowballstemmer==2.2.0
 Sphinx==3.4.3
+sphinx-prompt==1.5.0
 sphinx-rtd-theme==1.0.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2