diff --git a/simulator/Makefile b/simulator/Makefile
index a685318c21..f076be2257 100644
--- a/simulator/Makefile
+++ b/simulator/Makefile
@@ -3,6 +3,15 @@
 # NOTE: Can be overridden externally.
 #
 
+#
+# As of Sep 2019, this is known to compile on Linux
+# in my case I had to
+# sudo apt-get install gcc-multilib g++-multilib
+# 
+# todo: automatically execute that command same as we automatically fetch submodules?
+# 
+
+
 
 CHIBIOS = ../firmware/ChibiOS
 RULESPATH = $(CHIBIOS)/os/common/startup/SIMIA32/compilers/GCC