Better explanation.

David Betz · David Betz · commit d8c785eb6162 · 2016-10-12T14:31:03.000-04:00
diff --git a/README.md b/README.md
@@ -50,7 +50,7 @@ Check out the submodules of Parallax-ESP:
     git submodule init
     git submodule update
 
-Build the firmware:
+Build the firmware (from the Parallax-ESP directory):
 
     make
 
