diff --git a/paint/assets/api.h b/paint/assets/api.h
new file mode 100644
index 00000000..a81e514c
--- /dev/null
+++ b/paint/assets/api.h
@@ -0,0 +1,10 @@
+
+// Begin API
+
+typedef struct context {
+	float brush_radius;
+} context_t;
+
+context_t *script_get_context(); // never NULL
+
+// End API