diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..b4c1316
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,5 @@
+max_width                      = 90
+newline_style                  = "Unix"
+single_line_if_else_max_width  = 80
+single_line_let_else_max_width = 80
+edition                        = "2021"
diff --git a/README.md b/README.md
index 8ada1c6..c0d0e03 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ For a full definition of acceptable arguments and flags, see `src/cli.rs`.
 
 ## Style Guides
 
-1. Use `cargo fmt` without any options to format the project. Do not use `rustfmt` as it formats on a per-file basis and removes disambiguate imports.
+1. Use `cargo fmt` with configurations speficied in `.rustfmt.toml` to format the project. Do not run `rustfmt` directly as it formats on a per-file basis and may remove disambiguate imports.
 
 2. Import types directly; prefer `File` instead of `std::fs::File` or `fs::File`, unless ambiguity forbids (`Error` and `io::Error`).
 
diff --git a/src/consts.rs b/src/consts.rs
index e3acf42..23cfde6 100644
--- a/src/consts.rs
+++ b/src/consts.rs
@@ -7,18 +7,11 @@ use clap::Parser;
 use crate::cli::CliArgs;
 
 /// The name of SealDice executable.
-pub const EXE_NAME: &str = if cfg!(windows) {
-    "sealdice-core.exe"
-} else {
-    "sealdice-core"
-};
+pub const EXE_NAME: &str =
+    if cfg!(windows) { "sealdice-core.exe" } else { "sealdice-core" };
 
 /// The name of this program.
-pub const UPD_NAME: &str = if cfg!(windows) {
-    "sealupd.exe"
-} else {
-    "sealupd"
-};
+pub const UPD_NAME: &str = if cfg!(windows) { "sealupd.exe" } else { "sealupd" };
 
 /// The command-line arguments accepted from the caller.
 pub static CLI_ARGS: LazyLock<CliArgs> = LazyLock::new(|| CliArgs::parse());
diff --git a/src/decompress/mod.rs b/src/decompress/mod.rs
index a396d20..dee9739 100644
--- a/src/decompress/mod.rs
+++ b/src/decompress/mod.rs
@@ -20,8 +20,8 @@ pub fn decompress<P>(src: P, dest: P) -> Result<(), Box<dyn Error>>
 where
     P: AsRef<Path>,
 {
-    let mut file =
-        File::open(src.as_ref()).map_err(|e| format!("open {:?}: {}", src.as_ref(), e))?;
+    let mut file = File::open(src.as_ref())
+        .map_err(|e| format!("open {:?}: {}", src.as_ref(), e))?;
     let dest = dest.as_ref();
 
     if let Err(err) = zip::decompress(&mut file, dest) {