diff --git a/identify/extensions.py b/identify/extensions.py
index cc9d95c..cc3a182 100644
--- a/identify/extensions.py
+++ b/identify/extensions.py
@@ -6,6 +6,7 @@
     'asciidoc': {'text', 'asciidoc'},
     'apinotes': {'text', 'apinotes'},
     'asar': {'binary', 'asar'},
+    'astro': {'text', 'astro'},
     'avif': {'binary', 'image', 'avif'},
     'avsc': {'text', 'avro-schema'},
     'bash': {'text', 'shell', 'bash'},