diff --git a/docbow_project/docbow/models.py b/docbow_project/docbow/models.py
index edf0435..169bdfc 100644
--- a/docbow_project/docbow/models.py
+++ b/docbow_project/docbow/models.py
@@ -75,7 +75,7 @@ class FileTypeAttachedFileKindManager(Manager):
 class FileTypeAttachedFileKind(Model):
     MIME_TYPES_RE = re.compile(r'^\s*(?:(?:text|image|audio|application|video)'
             r'/(?:\*|[a-z-]+)(?:\s+(?:text|image|audio|application|video)'
-            r'/(?:\*|[a-z-]+))*\s*)?$')
+            r'/(?:\*|[a-z-.]+))*\s*)?$')
 
     objects = FileTypeAttachedFileKindManager()