Update doc for the --chain flag
@@ -23,7 +23,10 @@ use structopt::StructOpt;
/// Shared parameters used by all `CoreParams`.
#[derive(Debug, StructOpt)]
pub struct SharedParams {
- /// Specify the chain specification (one of dev, local, or staging).
+ /// Specify the chain specification.
+ ///
+ /// It can be one of the predefined ones (dev, local, or staging) or it can be a path to a file with
+ /// the chainspec (such as one exported by the `build-spec` subcommand).
#[structopt(long, value_name = "CHAIN_SPEC")]
pub chain: Option<String>,
