diff --git a/docs.it4i/software/mpi/mpi.md b/docs.it4i/software/mpi/mpi.md
index e83fe0fcc367cfcfc361e7e1d7bb36df8be41333..ffe13d02bf0494861bc3b9510391c3b7d891ffba 100644
--- a/docs.it4i/software/mpi/mpi.md
+++ b/docs.it4i/software/mpi/mpi.md
@@ -10,6 +10,10 @@ The Karolina cluster provides several implementations of the MPI library:
 
 MPI libraries are activated via the environment modules.
 
+!!! note
+
+    All OpenMPI modules are configured with `setenv("SLURM_MPI_TYPE", "pmix_v4")`.
+
 Look up the modulefiles/mpi section in `ml av`:
 
 ```console