Auto merge of #1933 - steveklabnik:gh1855, r=alexcrichton

Fixes #1855

Author: bors

src/bin/run.rs

@@ -43,7 +43,9 @@ bin target it will be run. Otherwise `--bin` specifies the bin target to run,
 and `--example` specifies the example target to run. At most one of `--bin` or
 `--example` can be provided.
 
-All of the trailing arguments are passed to the binary to run.
+All of the trailing arguments are passed to the binary to run. If you're passing
+arguments to both Cargo and the binary, the ones after `--` go to the binary,
+the ones before go to Cargo.
 ";
 
 pub fn execute(options: Options, config: &Config) -> CliResult<Option<()>> {