README: add required packages for litex sim

diff --git a/README b/README
index 4e8c5a07127492b03ee2bd8d4b0ef85c51acef14..38f15ce6ded47fffe6d25ad709bf6432df07c4cc 100644 (file)
--- a/README
+++ b/README
@@ -69,6 +69,7 @@ boards:
 
 5. ... and/or install Verilator and test LiteX on your computer:
   Download and install Verilator: http://www.veripool.org/
+  Install libevent-devel / json-c-devel packages
   Go to boards/targets
   ./sim.py