diff --git a/sigal/gallery.py b/sigal/gallery.py
index 9a6064e..f44cb1a 100644
--- a/sigal/gallery.py
+++ b/sigal/gallery.py
@@ -102,7 +102,7 @@ class Media(UnicodeMixin):
             orig_path = join(s['destination'], self.path, s['orig_dir'])
             check_or_create_dir(orig_path)
             big_path = join(orig_path, self.src_filename)
-            if not os.path.isfile(big_path):
+            if not isfile(big_path):
                 copy(self.src_path, big_path,
                      symlink=s['orig_link'])
             return url_from_path(join(s['orig_dir'], self.src_filename))
@@ -111,7 +111,7 @@ class Media(UnicodeMixin):
     def thumbnail(self):
         """Path to the thumbnail image (relative to the album directory)."""
 
-        if not os.path.isfile(self.thumb_path):
+        if not isfile(self.thumb_path):
             # if thumbnail is missing (if settings['make_thumbs'] is False)
             if self.type == 'image':
                 generator = image.generate_thumbnail
diff --git a/sigal/templates/sigal.conf.py b/sigal/templates/sigal.conf.py
index 30b4fb4..1093642 100644
--- a/sigal/templates/sigal.conf.py
+++ b/sigal/templates/sigal.conf.py
@@ -187,7 +187,7 @@ ignore_files = []
 # contain all resized or original files (depending on `zip_media_format`).
 # zip_gallery = False   # False or 'archive.zip'
 # zip_media_format = 'resized'  # 'resized' or 'orig'
-# zip_skip_if_exists = false # Skip archive generation if archive is already present. Warning: new photos in an album won't be added to archive
+# zip_skip_if_exists = False # Skip archive generation if archive is already present. Warning: new photos in an album won't be added to archive
 
 # Specify a different locale. If set to '', the default locale is used.
 # locale = ''