diff --git a/README-merge-upstream.md b/README-merge-upstream.md
new file mode 100644
index 00000000..722b1248
--- /dev/null
+++ b/README-merge-upstream.md
@@ -0,0 +1,17 @@
+Note: Tether v1 uses a really old version of gulp-sass, which uses a really old version of node-sass, which doesn't build with modern versions of node.
+
+I managed to build the package by using node 8:
+
+> nvm use 8
+
+to rebuild node-sass first:
+
+> npm rebuild node-sass
+
+then used npm to install packages, not yarn, which didn't work:
+
+> npm install
+
+which let me
+
+> npm run build