add more help text

cmd/discreteLog.go

@@ -119,10 +119,14 @@ func discreteLog(cmd *cobra.Command, args []string) {
 
 // discreteLogCmd represents the discreteLog command
 var discreteLogCmd = &cobra.Command{
-	Use:   "discrete-log",
+	Use:   "discrete-log -b N -m N -e N",
 	Short: "Compute the discrete logarithm",
-	Long:  `Compute the discrete logarithm.`,
-	Run:   discreteLog,
+	Long: `Compute the discrete logarithm.
+
+Given a base b, modulus m, and element e, compute a value k such that b^k = e (mod m).
+
+Note that no efficient method of finding the discrete logarithm is currently known. For slightly improved performance, the order of the group (i.e. the totient of m) can be provided.`,
+	Run: discreteLog,
 }
 
 func init() {