diff --git a/magic/Magdir/matroska b/magic/Magdir/matroska
index 0ede715..d3d7349 100644
--- a/magic/Magdir/matroska
+++ b/magic/Magdir/matroska
@@ -13,3 +13,11 @@
 # DocType contents:
 >>8		string		matroska	Matroska data
 !:mime  video/x-matroska
+
+# EBML id:
+0		belong		0x1a45dfa3
+# DocType id:
+>0		search/4096 	\x42\x82
+# DocType contents:
+>>&1		string		webm	WebM
+!:mime  video/webm