diff --git a/lib/fmt/comments.py b/lib/fmt/comments.py
index 9cc2982..70cf2f8 100644
--- a/lib/fmt/comments.py
+++ b/lib/fmt/comments.py
@@ -301,7 +301,7 @@ def beautify(text, lang, options):
 
     # temporary added line that removes invalid cache entries
     # that used wrong commenting methods
-    if lang in ['git']:
+    if lang in ["git", "django", "flask"]:
         cache.delete(digest)
 
     answer = cache.get(digest)
diff --git a/lib/languages_data.py b/lib/languages_data.py
index 4a18c57..0629e39 100644
--- a/lib/languages_data.py
+++ b/lib/languages_data.py
@@ -75,6 +75,10 @@ LEXER = {
     "eiffel" :  pygments.lexers.EiffelLexer,
     "clean"  :  pygments.lexers.CleanLexer,
     "dylan" :   pygments.lexers.DylanLexer,
+
+# not languages
+    "django"    : pygments.lexers.PythonLexer,
+    "flask"     : pygments.lexers.PythonLexer,
 }
 
 # canonical names are on the right side
@@ -119,7 +123,10 @@ VIM_NAME = {
     'mathematica':  'mma',
     'wolfram-mathematica': 'mma',
 
+    # not languages
     'git'       :   'sh',
+    'django'    :   'python',
+    'flask'     :   'python',
 }
 
 SO_NAME = {