diff --git a/freepost/__init__.py b/freepost/__init__.py
index aef0098..ba8b3ff 100755
--- a/freepost/__init__.py
+++ b/freepost/__init__.py
@@ -64,7 +64,7 @@ template = functools.partial (
 # "bleach" library is used to sanitize the HTML output of jinja2's "md2html"
 # filter. The library has only a very restrictive list of white-listed
 # tags, so we add some more here.
-bleach.sanitizer.ALLOWED_TAGS += [ 'br', 'img', 'p', 'pre' ]
+bleach.sanitizer.ALLOWED_TAGS += [ 'br', 'img', 'p', 'pre', 'h1', 'h2', 'h3' ]
 bleach.sanitizer.ALLOWED_ATTRIBUTES.update ({
     'img': [ 'src' ]
 })