diff --git a/docs.it4i/software/viz/insitu.md b/docs.it4i/software/viz/insitu.md
index 84869ff0ef70b7ea7cb6c3511a334f75a4120dd3..faa04c8ab8454dc1d5766f4a446f9c5daa06084e 100644
--- a/docs.it4i/software/viz/insitu.md
+++ b/docs.it4i/software/viz/insitu.md
@@ -48,14 +48,14 @@ It will generate the CxxFullExampleAdaptor executable file. This can be later ru
 Provided example is a simple MPI program. Main executing part is written in FEDriver.cxx. It is a simulator code that creates computational grid   
 
 
-```c++
-1 #include ahoj.h
-2
-3 int main() {
-4
-5
-6 return 0;
-7 }
+``` line-numbers
+#include ahoj.h
+
+int main() {
+
+
+return 0;
+}
 ```
 
 mpirun -n 2 ./CxxFullExample 30 30 30 ../SampleScripts/feslicescript.py