update doc

ocots · ocots · commit 0d50e46ba6d2 · 2024-05-24T20:42:30.000+02:00
diff --git a/docs/src/tutorial-goddard.md b/docs/src/tutorial-goddard.md
@@ -60,7 +60,7 @@ mf = 0.6    # final mass to target
 
 @def ocp begin # definition of the optimal control problem
 
-    tf, variable
+    tf ∈ R, variable
     t ∈ [ t0, tf ], time
     x ∈ R³, state
     u ∈ R, control
