diff --git a/ssl-check.sh b/ssl-check.sh
index 5cc6e5e7..f1b69d05 100755
--- a/ssl-check.sh
+++ b/ssl-check.sh
@@ -330,6 +330,46 @@ set_summary()
     fi
 }
 
+##########################################
+# Purpose: Describe how the script works
+# Arguments:
+#   None
+##########################################
+usage()
+{
+    echo "Usage: $0 [ -e email address ] [-E sender email address] [ -x days ] [-q] [-a] [-b] [-h] [-i] [-n] [-N] [-v]"
+    echo "       { [ -s common_name ] && [ -p port] } || { [ -f cert_file ] } || { [ -c cert file ] } || { [ -d cert dir ] }"
+    echo ""
+    echo "  -a                : Send a warning message through E-mail"
+    echo "  -b                : Will not print header"
+    echo "  -c cert file      : Print the expiration date for the PEM or PKCS12 formatted certificate in cert file"
+    echo "  -d cert directory : Print the expiration date for the PEM or PKCS12 formatted certificates in cert directory"
+    echo "  -e E-mail address : E-mail address to send expiration notices"
+    echo "  -E E-mail sender  : E-mail address of the sender"
+    echo "  -f cert file      : File with a list of FQDNs and ports"
+    echo "  -h                : Print this screen"
+    echo "  -i                : Print the issuer of the certificate"
+    echo "  -k password       : PKCS12 file password"
+    echo "  -n                : Run as a Nagios plugin"
+    echo "  -N                : Run as a Nagios plugin and output one line summary (implies -n, requires -f or -d)"
+    echo "  -p port           : Port to connect to (interactive mode)"
+    echo "  -s commmon name   : Server to connect to (interactive mode)"
+    echo "  -t type           : Specify the certificate type"
+    echo "  -q                : Don't print anything on the console"
+    echo "  -v                : Specify a specific protocol version to use (tls, ssl2, ssl3)"
+    echo "  -V                : Only print validation data"
+    echo "  -x days           : Certificate expiration interval (eg. if cert_date < days)"
+    echo ""
+}
+
+
+##########################################################################
+# Purpose: Connect to a server ($1) and port ($2) to see if a certificate
+#          has expired
+# Arguments:
+#   $1 -> Server name
+#   $2 -> TCP port to connect to
+##########################################################################
 check_server_status() {
 
     if [ "_${2}" = "_smtp" -o "_${2}" = "_25" ]
@@ -586,4 +626,4 @@ fi
 
 rm -f ${CERT_TMP} ${ERROR_TMP}
 
-exit 0
\ No newline at end of file
+exit 0