From 930c4da78765a5cef68139c53b08553ee5809e4f Mon Sep 17 00:00:00 2001
From: Nicolas Gallego-Ortiz <nicgallego@gmail.com>
Date: Mon, 26 Feb 2024 16:11:37 +0100
Subject: [PATCH] Update tsunami.f90

---
 src/ch02/tsunami.f90 | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/ch02/tsunami.f90 b/src/ch02/tsunami.f90
index 618edfa..979f592 100644
--- a/src/ch02/tsunami.f90
+++ b/src/ch02/tsunami.f90
@@ -24,6 +24,7 @@ program tsunami
 
   ! check input parameter values
   if (grid_size <= 0) stop 'grid_size must be > 0'
+  if (num_time_steps <= 0) stop 'num_time_steps must be > 0'
   if (dt <= 0) stop 'time step dt must be > 0'
   if (dx <= 0) stop 'grid spacing dx must be > 0'
   if (c <= 0) stop 'background flow speed c must be > 0'