diff --git a/README.md b/README.md
index 8f2055db..3335d62c 100644
--- a/README.md
+++ b/README.md
@@ -17,11 +17,20 @@ That mapping can be used to generate a new deob with everything renamed for you.
 
 ## Instructions
 
+Build requirements:
+Java 8+
+
+Runtime requirements:
+SD: Java 8+
+HD on Windows, use Java 15 or lower. There is a JOGL issue on 16+ related to how they grab the WGL context from the window.
+HD on Linux: Java 8+
+HD on macOS: Not possible yet on latest macOS. Might work for earlier OS versions.
+
 ```
 git clone https://github.com/Pazaz/RT4-Client.git
 cd RT4-Client
 ./gradlew run
 ```
 
-You will be connected to a test server automatically.
+You will be connected to a test server automatically.  
 This server is provided by 2009scape for their own internal developments.