diff --git a/README.md b/README.md
index 1322cbd34..8eccc15ca 100644
--- a/README.md
+++ b/README.md
@@ -95,5 +95,9 @@ favourite tool, and I will link it in the README!
 Difftastic is open source under the MIT license, see LICENSE for more
 details.
 
+This repository also includes tree-sitter parsers by other authors in
+the `vendor/` directory. These are a mix of the MIT license and the
+Apache license. See `vendor/*/LICENSE` for more details.
+
 Files in `sample_files/` are also under the MIT license unless stated
 otherwise in their header.