use the release flag so that the instructions can be used verbatim

Also, the location of the executable depends on this flag.

diff --git a/README.md b/README.md
index 9783000758bbf4641482ab8f9f1c3d3bf6b00a77..a91ce449bb929e7c62cfd64f922475205cd913d2 100644 (file)
--- a/README.md
+++ b/README.md
@@ -121,11 +121,11 @@ can be done as follows:
 ```
 $> git clone https://github.com/mthom/scryer-prolog
 $> cd scryer-prolog
-$> cargo build [--release]
+$> cargo build --release
 ```
 
-The optional `--release` flag will perform various optimizations,
-producing a faster executable.
+The `--release` flag performs various optimizations, producing a
+faster executable.
 
 On Windows, Scryer Prolog is easier to build inside a [MSYS2](https://www.msys2.org/)
 environment as some crates may require native C compilation. However,