diff --git a/doc/conf.py b/doc/conf.py
index 250fb3a..9c677ad 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -16,7 +16,8 @@ import sys, os
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
-sys.path.insert(0, os.path.abspath('..')) # Folder containing mceditlib
+sys.path.insert(0, os.path.abspath('..'))  # Folder containing mceditlib
+sys.path.insert(0, os.path.abspath('extensions'))  # extensions
 
 # -- General configuration -----------------------------------------------------
 
@@ -25,7 +26,7 @@ sys.path.insert(0, os.path.abspath('..')) # Folder containing mceditlib
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ['sphinx.ext.autodoc', 'sphinx.ext.viewcode']
+extensions = ['sphinx.ext.autodoc', 'sphinx.ext.viewcode', 'sphinx_nounderscore']
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']
diff --git a/doc/extensions/sphinx_nounderscore.py b/doc/extensions/sphinx_nounderscore.py
new file mode 100644
index 0000000..0629c2d
--- /dev/null
+++ b/doc/extensions/sphinx_nounderscore.py
@@ -0,0 +1,37 @@
+"""
+:Description: Sphinx extension to remove leading under-scores from directories names in the html build output directory.
+"""
+import os
+import shutil
+
+
+def setup(app):
+    """
+    Add a html-page-context  and a build-finished event handlers
+    """
+    app.connect('html-page-context', change_pathto)
+    app.connect('build-finished', move_private_folders)
+                
+def change_pathto(app, pagename, templatename, context, doctree):
+    """
+    Replace pathto helper to change paths to folders with a leading underscore.
+    """
+    pathto = context.get('pathto')
+    def gh_pathto(otheruri, *args, **kw):
+        if otheruri.startswith('_'):
+            otheruri = otheruri[1:]
+        return pathto(otheruri, *args, **kw)
+    context['pathto'] = gh_pathto
+    
+def move_private_folders(app, e):
+    """
+    remove leading underscore from folders in in the output folder.
+    
+    :todo: should only affect html built
+    """
+    def join(dir):
+        return os.path.join(app.builder.outdir, dir)
+    
+    for item in os.listdir(app.builder.outdir):
+        if item.startswith('_') and os.path.isdir(join(item)):
+            shutil.move(join(item), join(item[1:]))
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