diff --git a/src_SSITH_P3/README.txt b/src_SSITH_P3/README.txt
index 4118ad1..00b778f 100644
--- a/src_SSITH_P3/README.txt
+++ b/src_SSITH_P3/README.txt
@@ -28,6 +28,14 @@ into this socket:
     - Baseline BOOM (Chisel) based core
     - Variations/alternatives by various SSITH project teams
 
+>================================================================
+Extra dependencies:
+
+On top of the dependencies in the top project, you must have a build of bsc-contrib,
+which you can find here: https://github.com/B-Lang-org/bsc-contrib
+The Makefile expects the folder that is generated in bsc-contrib/inst/lib/Libraries/Bus
+to be located in the default bsc build at bsc/inst/lib/Libraries.
+
 >================================================================
 Whenever there are changes to the Toooba core, rerun: