diff --git a/src/to-json/cbindgen.toml b/src/to-json/cbindgen.toml
new file mode 100644
index 0000000..cb8d3fd
--- /dev/null
+++ b/src/to-json/cbindgen.toml
@@ -0,0 +1,3 @@
+language = "C"
+pragma_once = true
+include_version = true
diff --git a/src/to-json/to_json.h b/src/to-json/to_json.h
index ccde887..c93c353 100644
--- a/src/to-json/to_json.h
+++ b/src/to-json/to_json.h
@@ -1,3 +1,7 @@
+#pragma once
+
+/* Generated with cbindgen:0.23.0 */
+
 #include <stdarg.h>
 #include <stdbool.h>
 #include <stdint.h>