diff --git a/src/custom-types.json b/src/custom-types.json
index f95ffdfc..4cdf33d0 100644
--- a/src/custom-types.json
+++ b/src/custom-types.json
@@ -501,6 +501,12 @@
   "application/zip": {
     "compressible": false
   },
+  "application/dicom": {
+    "source": [
+        "https://en.wikipedia.org/wiki/DICOM"
+      ],
+    "extensions": ["dcm"]
+  },
   "audio/3gpp": {
     "compressible": false,
     "extensions": ["3gpp"]