diff --git a/README.md b/README.md
index 21ba631..16fe231 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ It has many issues right now, such has(but not limited to;)
 However, I (me, David) am planning on fixing many of those issues soon.
 
 To build Espresso, type 'make build' at the command line.
+(You must already have installed the GCC cross-compiler: https://wiki.osdev.org/GCC_Cross-Compiler)
 
 Have a good day.