add more help text

cmd/partitions.go

@@ -89,10 +89,20 @@ func partitions(cmd *cobra.Command, args []string) {
 
 // partitionsCmd represents the partitions command
 var partitionsCmd = &cobra.Command{
-	Use:   "partitions",
+	Use:   "partitions -n N -k N",
 	Short: "Compute the number of partitions of an integer",
-	Long:  `Compute the number of partitions of an integer.`,
-	Run:   partitions,
+	Long: `Compute the number of partitions of an integer.
+
+For example, 4 can be partitioned into
+4
+3+1
+2+2
+2+1+1
+1+1+1+1
+so p(n) = 5.
+
+To compute the number of partitions into at most k parts, provide the -k flag.`,
+	Run: partitions,
 }
 
 func init() {