diff --git a/meta-yocto/conf/local.conf.sample b/meta-yocto/conf/local.conf.sample
index 38507e3..a4a8192 100644
--- a/meta-yocto/conf/local.conf.sample
+++ b/meta-yocto/conf/local.conf.sample
@@ -17,12 +17,12 @@
 # These two options control how much parallelism BitBake should use. The first 
 # option determines how many tasks bitbake should run in parallel:
 #
-#BB_NUMBER_THREADS = "4"
+#BB_NUMBER_THREADS ?= "4"
 # 
 # The second option controls how many processes make should run in parallel when
 # running compile tasks:
 #
-#PARALLEL_MAKE = "-j 4"
+#PARALLEL_MAKE ?= "-j 4"
 #
 # For a quad-core machine, BB_NUMBER_THREADS = "4", PARALLEL_MAKE = "-j 4" would
 # be appropriate for example.