Update README.md

README.md

@@ -39,7 +39,7 @@ compile 'com.github.fslev:json-compare:<version.from.maven.central>'
 ```
 
 ### Match any JSON convertible Java objects
-JSONCompare will automatically try to convert any given expected or actual Java objects to Jackson JsonNodes and match them.  
+JSONCompare will automatically try to convert any given expected or actual Java objects to [Jackson JsonNode](https://fasterxml.github.io/jackson-databind/javadoc/2.7/com/fasterxml/jackson/databind/JsonNode.html)s and match them.  
 ```javascript
 // expected as String with regex
 String expectedString = "{\"a\":1, \"b\": [4, \"ipsum\", \"\\\\d+\"]}";