diff --git a/01-intro.tex b/01-intro.tex
index e0a61bc..a7a718f 100644
--- a/01-intro.tex
+++ b/01-intro.tex
@@ -145,10 +145,10 @@ \section{"Hello, World" in MPI}
   Important! If you run application directly (\texttt{./hello\_mpi}) you will not get expected result!
 
   Linux: \\
-  \texttt{mpiexec -n 4 ./hello\_mpi}
+  \texttt{mpirun -n 4 ./hello\_mpi}
 
   Windows: \\
-  \texttt{mpirun -n 4 hello\_mpi.exe}
+  \texttt{mpiexec -n 4 hello\_mpi.exe}
 \end{frame}
 
 \section{Brief API calls overview}