diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
new file mode 100644
index 00000000000..a2fb9f977b6
--- /dev/null
+++ b/.github/CODEOWNERS
@@ -0,0 +1,2 @@
+# Automatically tag in libraries maintainers on Q# API changes.
+*.qs    @microsoft/quantumlibraries