diff --git a/scripts/validate/weeder.sh b/scripts/validate/weeder.sh
new file mode 100755
index 000000000..ed811b6e5
--- /dev/null
+++ b/scripts/validate/weeder.sh
@@ -0,0 +1,10 @@
+
+
+# First, install Weeder:
+#   cabal install weeder
+
+cabal clean
+cabal build -O0 -j all
+
+weeder -N
+
diff --git a/weeder.toml b/weeder.toml
new file mode 100644
index 000000000..3c2ca577c
--- /dev/null
+++ b/weeder.toml
@@ -0,0 +1,10 @@
+roots = [
+    "^Main.main$",
+    "^Paths_.*",
+    "^Swarm.App.demoWeb$",
+    "^Swarm.Doc.Gen.generateDocs$",
+    "^Swarm.Web.Tournament.webMain$",
+    ]
+
+type-class-roots = true
+