Added note about avr-libc also being required at least for arch

diff --git a/tmk_core/doc/build.md b/tmk_core/doc/build.md
index 20702e94c96304612fd72c5ba1ee66dc9e8e1d54..dffc699a3af3b59082a8c014386dce566a92dac9 100644 (file)
--- a/tmk_core/doc/build.md
+++ b/tmk_core/doc/build.md
@@ -6,7 +6,7 @@ Download and Install
 --------------------
 ### 1. Install Tools
 
-1. **Toolchain** On Windows install [MHV AVR Tools][mhv] for AVR GCC compiler and [Cygwin][cygwin](or [MinGW][mingw]) for shell terminal. On Mac you can use [CrossPack][crosspack]. On Linux you can install AVR GCC with your favorite package manager.
+1. **Toolchain** On Windows install [MHV AVR Tools][mhv] for AVR GCC compiler and [Cygwin][cygwin](or [MinGW][mingw]) for shell terminal. On Mac you can use [CrossPack][crosspack]. On Linux you can install AVR GCC (and avr-libc) with your favorite package manager.
 
 2. **Programmer** On Windows install [Atmel FLIP][flip]. On Mac and Linux install [dfu-programmer][dfu-prog].