diff --git a/.gitignore b/.gitignore
index 3df030f9..96237474 100644
--- a/.gitignore
+++ b/.gitignore
@@ -9,3 +9,4 @@ check-plan.yaml
 /constraints.yaml
 /snapshot.yaml
 /snapshot-incomplete.yaml
+/constraints.yaml.previous
diff --git a/check-lts b/check-lts
new file mode 100755
index 00000000..e23566cc
--- /dev/null
+++ b/check-lts
@@ -0,0 +1,14 @@
+#!/bin/bash
+
+# Convenience script for checking constraints locally
+
+cd `dirname $0`
+
+export GHCVER=$(sed -n "s/^ghc-version: \"\(.*\)\"/\1/p" "lts-build-constraints.yaml")
+
+LTS="lts-$@"
+curator update &&
+  curator constraints --target=$LTS &&
+  curator snapshot-incomplete --target=$LTS &&
+  curator snapshot &&
+  stack --resolver ghc-$GHCVER exec curator check-snapshot
diff --git a/lts-build-constraints.yaml b/lts-build-constraints.yaml
old mode 100644
new mode 100755