diff --git a/build-spec.json b/build-spec.json
new file mode 100644
index 0000000..d768cc1
--- /dev/null
+++ b/build-spec.json
@@ -0,0 +1 @@
+{"clone-url": "https://github.com/explosion/thinc.git", "package-name": "thinc", "commit": "wip/pin-numpy", "options": {"llvm": false, "rust": false, "universal": false, "skip_tests": false}, "upload-to": {"type": "github-release", "repo-id": "explosion/wheelwright", "release-id": "thinc-wip/pin-numpy-4"}}
\ No newline at end of file