From 9a2c4447835ccc014b593e242872457a95f4c6ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Johanna=20S=C3=B6rng=C3=A5rd?= <jsorngard@gmail.com>
Date: Sat, 5 Oct 2024 14:58:25 +0200
Subject: [PATCH] Add comment about trait impl domain domain

---
 src/lib.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/lib.rs b/src/lib.rs
index 0aecd55..701f05e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -385,6 +385,8 @@ impl LambertW for f32 {
     ///
     /// Evaluated with the approximation with 24-bits of accuracy from the paper, but on 32-bit floats.
     ///
+    /// Arguments smaller than -1/e (≈ -0.36787944) result in [`NAN`](f32::NAN).
+    ///
     /// Delegates to the [`lambert_w0f`] function.
     ///
     /// # Example
@@ -406,6 +408,8 @@ impl LambertW for f32 {
     ///
     /// Evaluated with the approximation with 24-bits of accuracy from the paper, but on 32-bit floats.
     ///
+    /// Arguments smaller than -1/e (≈ -0.36787944) or larger than 0 result in [`NAN`](f32::NAN).
+    ///
     /// Delegates to the [`lambert_wm1f`] function.
     ///
     /// # Example
@@ -427,6 +431,8 @@ impl LambertW for f64 {
     type Output = Self;
     /// The principal branch of the Lambert W function evaluated to 50 bits of accuracy.
     ///
+    /// Arguments smaller than -1/e (≈ -0.36787944117144233) result in [`NAN`](f64::NAN).
+    ///
     /// Delegates to the [`lambert_w0`] function.
     ///
     /// # Example
@@ -446,6 +452,8 @@ impl LambertW for f64 {
     }
     /// The secondary branch of the Lambert W function evaluated to 50 bits of accuracy.
     ///
+    /// Arguments smaller than -1/e (≈ -0.36787944117144233) or larger than 0 result in [`NAN`](f64::NAN).
+    ///
     /// Delegates to the [`lambert_wm1`] function.
     ///
     /// # Example