diff --git a/BUILDING b/BUILDING
index 19f637074225cfa9cc26a2583da2b654ec0f1deb..a1134e87a81cc32391d33a3950670218591630a3 100644
--- a/BUILDING
+++ b/BUILDING
@@ -669,4 +669,9 @@ was compiled properly.  A full set of builds via build.sh might be
 good at this point too.
 
 Some of the details for each command may have changed;  You can get
-help for each command by using the -h argument.
\ No newline at end of file
+help for each command by using the -h argument.
+
+In particular steps 3, 4, and 5 can be combined into one by using the
+-c, -r, and -l options for cross-build-world.sh.  The -c option cleans
+out the targe and cross directories; -r does step 4; and -l does step
+5.