diff --git a/languages.toml b/languages.toml
index 945082a3c..fc332a3d4 100644
--- a/languages.toml
+++ b/languages.toml
@@ -2776,7 +2776,8 @@ file-types = [
   "musicxml",
   "glif",
   "ui",
-  "sublime-snippet"
+  "sublime-snippet",
+  "xsl"
 ]
 block-comment-tokens = { start = "<!--", end = "-->" }
 indent = { tab-width = 2, unit = "  " }