diff --git a/README.md b/README.md
index 311913a08..c813fcbaf 100644
--- a/README.md
+++ b/README.md
@@ -64,3 +64,5 @@ Contributions are welcome! We welcome any type of contribution, not only code. A
 - [OpenJDK](https://github.com/PojavLauncherTeam/openjdk-multiarch-jdk8u): [GNU GPLv2 License](https://openjdk.java.net/legal/gplv2+ce.html).<br>
 - [LWJGL3](https://github.com/PojavLauncherTeam/lwjgl3): [BSD-3 License](https://github.com/LWJGL/lwjgl3/blob/master/LICENSE.md).
 - [LWJGLX](https://github.com/PojavLauncherTeam/lwjglx) (LWJGL2 API compatibility layer for LWJGL3): unknown license.<br>
+- [pro-grade](https://github.com/pro-grade/pro-grade) (Java sandboxing security manager): [Apache License 2.0](https://github.com/pro-grade/pro-grade/blob/master/LICENSE.txt).
+