Build.md

@@ -38,12 +38,13 @@ All Layers other than mpi require the tcp Layer and MiniPMI to be available.
 The following transport layers and other variables may be used:
 
 | Layer      | Variable       | Default          | Description |
-| ----- | -------- | ------- | ----------- |
+| ---------- | -------------- | ---------------- | ----------- |
 | `mpi`      | `HAVE_MPI`     | Enabled          | MPI |
 | `tcp`      | `HAVE_TCP`     | Disabled         | Automatically enabled if any Layer below is enabled |
 | `ibverbs`  | `HAVE_IBVERBS` | Disabled         | Verbs-based implementation |
 | `psm2`     | `HAVE_PSM2`    | Disabled         | PSM2 (Omni-Path) |
 | `ucp`      | `HAVE_UCP`     | Disabled         | UCX (using high level api ucp) |
+| `portals`  | `HAVE_PORTALS` | Disabled         | Portals4 (f.ex. BXI through Portals) |
 | `cuda`     | `HAVE_CUDA`    | Disabled         | NVLink (node-internal) |
 |            | `CUARCH`       |                  | Needs to be set if `cuda` is enable |
 |            | `V`            |                  | If defined prints detailed steps and additional variables |