More accurate instructions...

diff --git a/klibc/README b/klibc/README
index 7b157e2..2bce070 100644
--- a/klibc/README
+++ b/klibc/README
@@ -19,11 +19,11 @@
    the appropriate architecture, and set CROSS to your toolchain
    prefix.
 
-   IMPORTANT: if you're on a 64-bit machine with a 32-bit default
-   userland (such as most sparc or mips machines), you need to either
-   set ARCH to the 32-bit architecture (to build the 32-bit version)
-   or set CROSS to point to the 64-bit compiler (to build the 64-bit
-   version.)
+   IMPORTANT: if you're on a 64-bit machine with a 32-bit userland
+   (such as most sparc or mips machines), and you want to build the
+   32-bit version (usually, but not always smaller); you need to set
+   ARCH to the 32-bit architecture as well as set up the
+   linux/include/asm symlink to point to the 32-bit architecture.
 
    If you are on ARM, and want to build a thumb version of the library
    (this is supported), change OPTFLAGS in arch/arm/MCONFIG to build