diff --git a/README.md b/README.md
index bc83c7a..6bfe54a 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Command line options:
 -e    Compression file extension, exclude leading "." (default: gz)
 -f    Output file name (default is the timestamp)
 -h    Shows this help text
--i    Input directory (path to world folder)
+-i    Input directory (path to world folder, use -i once for each world)
 -l    Compression level (default: 3)
 -m    Maximum backups to keep, use -1 for unlimited (default: 128)
 -o    Output directory
diff --git a/backup.sh b/backup.sh
index a5ce55b..5778e51 100755
--- a/backup.sh
+++ b/backup.sh
@@ -55,7 +55,7 @@ while getopts 'a:cd:e:f:hi:l:m:o:p:qr:s:t:u:vw:x' FLAG; do
        echo "-e    Compression file extension, exclude leading \".\" (default: gz)"
        echo "-f    Output file name (default is the timestamp)"
        echo "-h    Shows this help text"
-       echo "-i    Input directory (path to world folder)"
+       echo "-i    Input directory (path to world folder, use -i once for each world)"
        echo "-l    Compression level (default: 3)"
        echo "-m    Maximum backups to keep, use -1 for unlimited (default: 128)"
        echo "-o    Output directory"