diff --git a/codegen/templates/quat.rs.tera b/codegen/templates/quat.rs.tera
index 2caeaa7c..a00568d3 100644
--- a/codegen/templates/quat.rs.tera
+++ b/codegen/templates/quat.rs.tera
@@ -660,6 +660,7 @@ impl {{ self_t }} {
         {{ vec4_t }}::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f32/coresimd/quat.rs b/src/f32/coresimd/quat.rs
index eca7a0ee..85189ed6 100644
--- a/src/f32/coresimd/quat.rs
+++ b/src/f32/coresimd/quat.rs
@@ -516,6 +516,7 @@ impl Quat {
         Vec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f32/neon/quat.rs b/src/f32/neon/quat.rs
index 7dca3a42..057c5808 100644
--- a/src/f32/neon/quat.rs
+++ b/src/f32/neon/quat.rs
@@ -521,6 +521,7 @@ impl Quat {
         Vec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f32/scalar/quat.rs b/src/f32/scalar/quat.rs
index cf5d6482..d7d16116 100644
--- a/src/f32/scalar/quat.rs
+++ b/src/f32/scalar/quat.rs
@@ -528,6 +528,7 @@ impl Quat {
         Vec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f32/sse2/quat.rs b/src/f32/sse2/quat.rs
index a430a4f1..b1872bae 100644
--- a/src/f32/sse2/quat.rs
+++ b/src/f32/sse2/quat.rs
@@ -524,6 +524,7 @@ impl Quat {
         Vec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f32/wasm32/quat.rs b/src/f32/wasm32/quat.rs
index 6632a880..ee24bbff 100644
--- a/src/f32/wasm32/quat.rs
+++ b/src/f32/wasm32/quat.rs
@@ -516,6 +516,7 @@ impl Quat {
         Vec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {
diff --git a/src/f64/dquat.rs b/src/f64/dquat.rs
index 9eac3637..0d78be4d 100644
--- a/src/f64/dquat.rs
+++ b/src/f64/dquat.rs
@@ -510,6 +510,7 @@ impl DQuat {
         DVec4::from(self).is_finite()
     }
 
+    /// Returns `true` if any elements are `NAN`.
     #[inline]
     #[must_use]
     pub fn is_nan(self) -> bool {