diff --git a/simu/src/main.rs b/simu/src/main.rs
index ba40140..9922e3b 100644
--- a/simu/src/main.rs
+++ b/simu/src/main.rs
@@ -391,18 +391,27 @@ fn main() -> Result<(), Error> {
                                                     v,
                                                     cpu::instr_to_text(v, i, &simulation.book)
                                                 );
-                                                false
+                                                true
                                             }
                                             Err(e) => {
                                                 println!("{e}");
-                                                false
+                                                true
                                             }
                                         }
                                     } else {
+                                        println!("{HELP_MSG}");
                                         true
                                     }
                                 }
                                 "c" | "context" => false,
+                                "u" | "up" => {
+                                    while !simulation.error
+                                        && simulation.ram[simulation.pc] != 0x8800_0000
+                                    {
+                                        simulation.step();
+                                    }
+                                    false
+                                }
                                 _ => {
                                     println!("{HELP_MSG}");
                                     true
@@ -435,5 +444,5 @@ step n  - step trough n instructions (alias s)
 run     - run program until exit / error (alias r)
 context - print context (alias c)
 print n - print ram content at address n and next 8 (alias p)
-        - repeat last step (yes, do no enter anything and press Enter)
+up      - run until the nex ret is reached (alias u)
 ";