diff --git a/.rustfmt.toml b/.rustfmt.toml
new file mode 100644
index 0000000..b7d70c3
--- /dev/null
+++ b/.rustfmt.toml
@@ -0,0 +1,2 @@
+format_macro_bodies = true
+format_macro_matchers = true
diff --git a/README.md b/README.md
index bad283c..9f08d4b 100644
--- a/README.md
+++ b/README.md
@@ -51,7 +51,7 @@ use ratatui::prelude::*;
 use ratatui_macros::constraints;
 
 assert_eq!(
-    constraints![==50, ==30%, >=3, <=1, ==1/2, =*1],
+    constraints![==50, ==30%, >=3, <=1, ==1/2, *=1],
     [
         Constraint::Length(50),
         Constraint::Percentage(30),
diff --git a/src/layout.rs b/src/layout.rs
index 14aa4d4..7b3c424 100644
--- a/src/layout.rs
+++ b/src/layout.rs
@@ -13,7 +13,7 @@
 /// assert_eq!(constraint!(== 1 / 3), Constraint::Ratio(1, 3));
 /// assert_eq!(constraint!(== 3), Constraint::Length(3));
 /// assert_eq!(constraint!(== 10 %), Constraint::Percentage(10));
-/// assert_eq!(constraint!(=* 1), Constraint::Fill(1));
+/// assert_eq!(constraint!(*= 1), Constraint::Fill(1));
 /// ```
 #[macro_export]
 macro_rules! constraint {
@@ -32,7 +32,7 @@ macro_rules! constraint {
     (== $expr:expr) => {
         ratatui::layout::Constraint::Length($expr)
     };
-    (=* $expr:expr) => {
+    (*= $expr:expr) => {
         ratatui::layout::Constraint::Fill($expr)
     };
 }
@@ -56,7 +56,7 @@ macro_rules! constraint {
 /// use ratatui::prelude::*;
 /// use ratatui_macros::constraints;
 /// assert_eq!(
-///     constraints![==50, ==30%, >=3, <=1, ==1/2, =*1],
+///     constraints![==50, ==30%, >=3, <=1, ==1/2, *=1],
 ///     [
 ///         Constraint::Length(50),
 ///         Constraint::Percentage(30),