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