diff --git a/Makefile b/Makefile
index 037667f..28bfa2d 100644
--- a/Makefile
+++ b/Makefile
@@ -15,10 +15,21 @@ else
 
 EXTRA_FLAGS += -I$(PWD)
 
-#KDIR	:= /usr/src/linux/
+#
+# KDIR is a path to a directory containing kernel source.
+# It can be specified on the command line passed to make to enable the module to 
+# be built and installed for a kernel other than the one currently running.
+# By default it is the path to the symbolic link created when 
+# the current kernel's modules were installed, but
+# any valid path to the directory in which the target kernel's source is located
+# can be provided on the command line.
+#
 KDIR	:= /lib/modules/$(shell uname -r)/build
 MDIR	:= /lib/modules/$(shell uname -r)
-PWD		:= $(shell pwd)
+PWD	:= $(shell pwd)
+KREL	:= $(shell cd ${KDIR} && make -s kernelrelease)
+MDIR	:= /lib/modules/${KREL}
+PWD	:= $(shell pwd)
 
 export CONFIG_EXFAT_FS := m