diff --git a/.gitignore b/.gitignore
index fad57161..d48b56e0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,4 +50,7 @@ libreoffice-wasm-package
 
 # test 
 dist-test
-test
\ No newline at end of file
+test
+# Sibling checkouts of the engine/viewer forks
+bentopdf-pdfium-viewer/
+bentopdf-pymupdf-wasm/