diff --git a/README.adoc b/README.adoc
index 5545eaf..6a615d7 100644
--- a/README.adoc
+++ b/README.adoc
@@ -22,7 +22,8 @@ _2020-09-02 12:46 JSON, YAML, XML, APIs linters, converters, validators, documen
 
 https://codebeautify.org/jsonvalidator <= multi-tool, well done +
 - https://codebeautify.org/yaml-to-json-xml-csv +
-- https://codebeautify.org/json-to-yaml
+- https://codebeautify.org/json-to-yaml +
+https://json-schema.org/specification.html
 https://editor.swagger.io/ +
 https://app.swaggerhub.com +
 https://www.asyncapi.com/ <= See Tooling tab +