diff --git a/identify/extensions.py b/identify/extensions.py
index f757cfc..04382fb 100644
--- a/identify/extensions.py
+++ b/identify/extensions.py
@@ -280,6 +280,7 @@
     '.gitlint': EXTENSIONS['ini'] | {'gitlint'},
     '.gitmodules': {'text', 'gitmodules'},
     '.hgrc': EXTENSIONS['ini'] | {'hgrc'},
+    '.isort.cfg': EXTENSIONS['ini'] | {'isort'},
     '.jshintrc': EXTENSIONS['json'] | {'jshintrc'},
     '.mailmap': {'text', 'mailmap'},
     '.mention-bot': EXTENSIONS['json'] | {'mention-bot'},