# Generate unambiguous restraints to keep molecules together during docking
In some scenarios, you might be docking proteins that contain
**structural gaps**, but you still want to keep the molecules and ligands
in their place together during the docking process. This is where the
`restraint` subcommand comes in handy.
It will generate **unambiguous restraints** to keep the molecules
together during docking.
## Usage
To run the `restraint` subcommand, you just need to provide the path to
the PDB file. For example:
```bash
haddock-restraints restraint path/to/complex.pdb > unambig.tbl
```
