diff --git a/README.md b/README.md
index 3b379e5..0aa4221 100644
--- a/README.md
+++ b/README.md
@@ -82,6 +82,15 @@ assert_relative_eq!(big, 703.2270331047702, max_relative = 4e-16);
 assert_relative_eq!(tiny, -715.7695669234213, max_relative = 4e-16);
 ```
 
+Importing the `LambertW` trait lets you call the functions with postfix notations:
+```rust
+use lambert_w::LambertW;
+
+let z = 2.0 * f64::ln(2.0);
+
+assert_abs_diff_eq!(z.lambert_w0(), f64::ln(2.0));
+```
+
 ## License
 
 Licensed under either of
diff --git a/src/lib.rs b/src/lib.rs
index 83a8522..55c4503 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -89,6 +89,18 @@ assert_relative_eq!(tiny, -715.7695669234213, max_relative = 4e-16);
 "#
 )]
 //!
+//! Importing the [`LambertW`] trait lets you call the functions with postfix notations:
+#![cfg_attr(
+    feature = "50bits",
+    doc = r#"
+use lambert_w::LambertW;
+
+let z = 2.0 * f64::ln(2.0);
+
+assert_abs_diff_eq!(z.lambert_w0(), f64::ln(2.0));
+"#
+)]
+//!
 //! The macros are from the [`approx`](https://docs.rs/approx/latest/approx/) crate, and are used in the documentation examples of this crate.
 //! The assertion passes if the two supplied values are the same to within floating point error, or within an optional epsilon or relative difference.
 //!