diff --git a/.drone.yml b/.drone.yml
new file mode 100644
index 0000000..65b7f3a
--- /dev/null
+++ b/.drone.yml
@@ -0,0 +1,11 @@
+---
+kind: pipeline
+name: default
+
+steps:
+- name: build, test and benchmark
+  image: golang
+  commands:
+  - go test
+  - go test -bench=.
+  - go build
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..721ffd8
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,8 @@
+module git.sudo.ca/tessa/ntree
+
+go 1.16
+
+require (
+	github.com/cznic/mathutil v0.0.0-20181122101859-297441e03548
+	github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..4928d7d
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,4 @@
+github.com/cznic/mathutil v0.0.0-20181122101859-297441e03548 h1:iwZdTE0PVqJCos1vaoKsclOGD3ADKpshg3SRtYBbwso=
+github.com/cznic/mathutil v0.0.0-20181122101859-297441e03548/go.mod h1:e6NPNENfs9mPDVNRekM7lKScauxd5kXTr1Mfyig6TDM=
+github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0 h1:OdAsTTz6OkFY5QxjkYwrChwuRruF69c169dPK26NUlk=
+github.com/remyoudompheng/bigfft v0.0.0-20200410134404-eec4a21b6bb0/go.mod h1:qqbHyh8v60DhA7CoWK5oRCqLrMHRGoxYCSS9EjAz6Eo=