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--- a/README.md
+++ b/README.md
@@ -1,3 +1,9 @@
 # swapfile
 
-Create and enable a swapfile for devices with USB storage
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+Create and enable a swapfile for devices with USB storage
+
+The script must be copied into /etc/init.d/ and given execution permission `chmod +x /etc/init.d/swapfile`
+
+The variable $SWPATH defines where the swapfile is located in the filesystem, so it must be changed accordingly
+
+It's assumed that USB storage is already configured via opkg and fstab
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