diff --git a/README.md b/README.md
index 4be23a92..511a7f17 100644
--- a/README.md
+++ b/README.md
@@ -48,6 +48,8 @@ Building
 After cloning this repository, build the project with Gradle by running `./gradlew build` and take the created jar out
 of the `build/libs` directory.
 
+You need JDK 17 or newer to build ViaBackwards.
+
 License
 -
 This project is licensed under the [GNU General Public License Version 3](LICENSE).