diff --git a/.README.md.un~ b/.README.md.un~
new file mode 100644
index 0000000..2ada1a4
Binary files /dev/null and b/.README.md.un~ differ
diff --git a/README.md b/README.md
index 03a9d8b..7bc1727 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,10 @@
 # check_mk-check-selinux
 
-check status of selinux
\ No newline at end of file
+Check status of selinux based on the output of the sestatus command.
+
+## SELinux reference
+The following (link)[https://github.com/SELinuxProject/selinux/blob/97fa708d867ecb26e8d1c766760947f8e3b9e59a/policycoreutils/sestatus/sestatus.c#L4] defines the output of the sestatus command.
+
+## State of booleans
+sestatus accepts a -b flag which display the state of all selinux booleans. This is not covered but may be of interest in the future.
+