diff --git a/pages/merlin6/05 Software Support/openmpi.md b/pages/merlin6/05 Software Support/openmpi.md
index 741df73..b3ad8b6 100644
--- a/pages/merlin6/05 Software Support/openmpi.md	
+++ b/pages/merlin6/05 Software Support/openmpi.md	
@@ -19,18 +19,39 @@ bind tasks in to cores and less customization is needed, while **'mpirun'** and
 configuration and should be only used by advanced users. Please, ***always*** adapt your scripts for using **'srun'** 
 before opening a support ticket. Also, please contact us on any problem when using a module.
 
-{{site.data.alerts.tip}} Always run OpenMPI with the <b>srun</b> command.
+{{site.data.alerts.tip}} Always run OpenMPI with the <b>srun</b> command. The only exception is for advanced users.
 {{site.data.alerts.end}}
 
-### PModules
+### OpenMPI with UCX
+
+**OpenMPI** supports **UCX** starting from version 3.0, but it’s recommended to use version 4.0 or higher due to stability and performance improvements.
+**UCX** should be used only by advanced users, as it requires to run it with **mpirun** (needs advanced knowledge) and is an exception for running MPI 
+without **srun** (**UCX** is not integrated at PSI within **srun**).
+
+For running UCX, one should add the following options to **mpirun**:
+
+```bash
+mpirun --np $SLURM_NTASKS -mca pml ucx --mca btl ^vader,tcp,openib,uct -x UCX_NET_DEVICES=mlx5_0:1 ./app
+```
+
+Alternatively, one can add the following options for debugging purposes (visit [UCX Logging](https://github.com/openucx/ucx/wiki/Logging) for possible `UCX_LOG_LEVEL` values):
+
+```bash
+-x UCX_LOG_LEVEL=<data|debug|warn|info|...> -x UCX_LOG_FILE=<filename>
+```
+
+## Supported OpenMPI versions
+
+For running OpenMPI properly in a Slurm batch system, ***OpenMPI and Slurm must be compiled accordingly***. 
 
 We can find a large number of compilations of OpenMPI modules in the PModules central repositories. However, only
-some of them are suitable for running in a Slurm cluster: ***any OpenMPI versions with suffixes ``_slurm`` or ``_merlin6`` 
-are suitable for running in the Merlin6 cluster***. Please, ***avoid using any other OpenMPI releases***.
+some of them are suitable for running in a Slurm cluster: ***any OpenMPI versions with suffixes `_slurm` 
+are suitable for running in the Merlin6 cluster***. Also, OpenMPI with suffix `_merlin6` can be used, but these will be fully
+replaced by the `_slurm` series in the future (so it can be used on any Slurm cluster at PSI). Please, ***avoid using any other OpenMPI releases***.
 
 {{site.data.alerts.tip}} Suitable <b>OpenMPI</b> versions for running in the Merlin6 cluster:
 <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;
-  <span class="terminal code highlight js-syntax-highlight plaintext" lang="plaintext" markdown="false">openmpi/&lt;version&gt;&#95;slurm
+  <span class="terminal code highlight js-syntax-highlight plaintext" lang="plaintext" markdown="false"><b>openmpi/&lt;version&gt;&#95;slurm</b>
   </span>&nbsp;<b>[<u>Recommended</u>]</b>
 </p>
 <p>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;-&nbsp;