diff --git a/doc/source/conf.py b/doc/source/conf.py
index 88221c1..51322f7 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -34,6 +34,15 @@ except:
           'WARNING: https://pypi.python.org/pypi/sphinxcontrib-doxylink\n')
     extensions = ['sphinx.ext.mathjax']
 
+# http://sphinx-doc.org/extensions.html#where-to-put-your-own-extensions
+sys.path.append(os.path.abspath('exts'))
+
+# We bundled the `rawfiles` sphinx extension to copy over files on sphinx build
+# https://pypi.python.org/pypi/sphinxcontrib-rawfiles
+extensions += ['rawfiles']
+
+rawfiles = ['fhelp/ctlike.html']
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
 
diff --git a/doc/source/exts/rawfiles.py b/doc/source/exts/rawfiles.py
new file mode 100644
index 0000000..5d7b24b
--- /dev/null
+++ b/doc/source/exts/rawfiles.py
@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+# Copied from https://bitbucket.org/birkenfeld/sphinx-contrib/
+import os
+import shutil
+
+def on_html_collect_pages(app):
+    for f in app.builder.config.rawfiles:
+        src = os.path.join(app.srcdir, f)
+        dst = os.path.join(app.builder.outdir, f)
+        # cleanup
+        if os.path.exists(dst):
+            if os.path.isdir(dst):
+                shutil.rmtree(dst)
+            elif os.path.isfile(dst):
+                os.remove(dst)
+        # copy file
+        if os.path.exists(src):
+            if os.path.isdir(src):
+                shutil.copytree(src, dst)
+            elif os.path.isfile(src):
+                shutil.copy(src, dst)
+            else:
+                msg = ('rawfiles target is not directory or file "%s".' % src)
+                app.builder.warn(msg)
+        else:
+            msg = ('rawfiles can not find "%s".' % src)
+            app.builder.warn(msg)
+
+    return ()
+
+def setup(app):
+    app.add_config_value('rawfiles', [], 'html')
+    app.connect("html-collect-pages", on_html_collect_pages)
\ No newline at end of file