diff --git a/converters/transformers.py b/converters/transformers.py
index 5c4d1e7..ea3e716 100755
--- a/converters/transformers.py
+++ b/converters/transformers.py
@@ -204,7 +204,7 @@ class RevealHelpTransformer(ConfigurableTransformers):
 
     def cell_transform(self, cell, other,count):
         ctype = cell.metadata.get('slideshow',{}).get('slide_type',None)
-        if ctype is None :
+        if ctype in [None, '-'] :
             cell.metadata.slideshow = {}
             cell.metadata.slideshow['slide_type'] = None
         elif ctype == 'fragment':
diff --git a/templates/reveal.tpl b/templates/reveal.tpl
index 71bf297..ffd1b3a 100644
--- a/templates/reveal.tpl
+++ b/templates/reveal.tpl
@@ -26,7 +26,7 @@
 <aside class="notes">
 {{ super() }}
 </aside>
-{% elif cell.metadata.slideshow.slide_tyle not in ['skip'] %}
+{% elif cell.metadata.slideshow.slide_type not in ['skip'] %}
 {{ super() }}
 {% endif %}