diff --git a/identify/extensions.py b/identify/extensions.py
index 8267bad..5616aa4 100644
--- a/identify/extensions.py
+++ b/identify/extensions.py
@@ -113,6 +113,7 @@
     'md': {'text', 'markdown'},
     'mdx': {'text', 'mdx'},
     'mib': {'text', 'mib'},
+    'mjs': {'text', 'javascript'},
     'mk': {'text', 'makefile'},
     'ml': {'text', 'ocaml'},
     'mli': {'text', 'ocaml'},