diff --git a/trajectory-kt/src/commonMain/kotlin/space/kscience/kmath/trajectory/Trajectory2D.kt b/trajectory-kt/src/commonMain/kotlin/space/kscience/kmath/trajectory/Trajectory2D.kt
index 59a8e61..36d997f 100644
--- a/trajectory-kt/src/commonMain/kotlin/space/kscience/kmath/trajectory/Trajectory2D.kt
+++ b/trajectory-kt/src/commonMain/kotlin/space/kscience/kmath/trajectory/Trajectory2D.kt
@@ -27,7 +27,7 @@ public sealed interface Trajectory2D {
     }
 
     public object S : Type {
-        override fun toString(): String = "L"
+        override fun toString(): String = "S"
     }
 
     public object L : Direction {