diff --git a/src/iana-types.json b/src/iana-types.json
index b6244c13..7e886093 100644
--- a/src/iana-types.json
+++ b/src/iana-types.json
@@ -605,6 +605,7 @@
     ]
   },
   "application/dicom": {
+    "extensions": ["dcm"],
     "sources": [
       "https://tools.ietf.org/rfc/rfc3240.txt",
       "https://www.iana.org/assignments/media-types/application/dicom"