diff --git a/json-schema.h b/json-schema.h
index 997736d..d5751c6 100644
--- a/json-schema.h
+++ b/json-schema.h
@@ -4,8 +4,11 @@
 #include "json.h"
 
 #define JSON_SCHEMA_VERSION "https://json-schema.org/draft/2020-12/schema"
+#define JSON_ERROR_MSG_MAX_LEN 512
 
 int validate_schema(json_object* schema, char* schema_directory, json_object* object, char* error_message);
 int validate_schema_from_file(const char* schema_file, json_object* object, char* error_message);
+void validate_schema_debug_enable();
+void validate_schema_debug_disable();
 
 #endif
\ No newline at end of file