diff --git a/cmd/crt.go b/cmd/crt.go
index 35bdac1..50d7438 100644
--- a/cmd/crt.go
+++ b/cmd/crt.go
@@ -113,9 +113,19 @@ func crt(cmd *cobra.Command, args []string) {
 // crtCmd represents the crt command
 var crtCmd = &cobra.Command{
 	Use:   "crt -r R R [R ...] -m M M [M ...]",
-	Short: "Solve a system of linear congruences",
-	Long:  `Solve a system of linear congruences.`,
-	Run:   crt,
+	Short: "Solve a system of linear congruences with the Chinese remainder theorem",
+	Long: `Solve a system of linear congruences by applying the Chinese remainder theorem.
+
+To use, provide the remainder R of each congruence, along with the corresponding modulus M for each congruence. For instance,
+
+mathtools crt -r 2 3 2 -m 3 5 7
+
+will solve the system of congruences
+x = 2 (mod 3)
+x = 3 (mod 5)
+x = 2 (mod 7)
+`,
+	Run: crt,
 }
 
 func init() {