diff --git a/src/data/config.typecheck.ts b/src/data/config.typecheck.ts
new file mode 100644
index 0000000..5e0b723
--- /dev/null
+++ b/src/data/config.typecheck.ts
@@ -0,0 +1,8 @@
+import teamLindy from "./teamLindy.json";
+import numbers from "./numbers.json";
+import balboa from "./balboa.json";
+import test from "./test.json";
+import { Config } from "./config";
+
+// Check that all config files have the expected type:
+export const configs: Config[] = [teamLindy, numbers, balboa, test];
diff --git a/src/data/test.json b/src/data/test.json
index f0f3a30..6a3871f 100644
--- a/src/data/test.json
+++ b/src/data/test.json
@@ -35,6 +35,10 @@
           "word": "Eagle slide",
           "description": "[Solo dance step]"
         },
+        {
+          "word": "Knee slap",
+          "description": "[Solo dance step]"
+        },
         {
           "word": "Texas Tommy",
           "description": "[Partnered dance step] swingout where leader puts follower in an armlock and follower spins out of it."