diff --git a/Readme.md b/Readme.md
index b2d972050b..a9827f51df 100644
--- a/Readme.md
+++ b/Readme.md
@@ -3,3 +3,4 @@ Place Paper Mario (U) (named baserom.z64) in the root directory, build `n64split
 ```
 ./splitrom.sh
 ```
+You'll need to build binutils manually with two targets: mips-sgi-irix5 and mips-linux-gnu - we don't have proper instructions yet, but see the Dockerfile for an example.