Update README.md

projects/human-heterodimers-w-crosslinks/README.md

@@ -47,7 +47,7 @@ These models qualify as "de novo modelling".
 - In this project, for each dimer only one model is stored at [ModelArchive](https://modelarchive.org/) (MA) but the other models for the same dimer are stored in a Zip archive that goes into MA with the model (`--selected_rank`)
 - Following our [Docker README](../docker/README.md), the conversion can be called like this:
   ```terminal
-  $ docker run --rm -v /home/user/models:/data -t converter:latest convert2modelcif --selected_rank 1Q9Y5J9-Q9Y5L4/
+  $ docker run --rm -v /home/user/models:/data -t converter:latest convert2modelcif --selected_rank 1 Q9Y5J9-Q9Y5L4/
   ```
   for a target directory `Q9Y5J9-Q9Y5L4`