diff --git a/src/n.rs b/src/n.rs
index 7890461..d3931f1 100644
--- a/src/n.rs
+++ b/src/n.rs
@@ -18,7 +18,7 @@ pub(crate) struct InterpND {
 
 impl InterpND {
     /// Interpolator dimensionality
-    pub fn ndim(&self) -> usize {
+    pub(crate) fn ndim(&self) -> usize {
         if self.values.len() == 1 {
             0
         } else {
diff --git a/src/traits.rs b/src/traits.rs
index b11eb13..5801437 100644
--- a/src/traits.rs
+++ b/src/traits.rs
@@ -2,10 +2,9 @@ use super::*;
 
 /// Methods applicable to all interpolators
 pub trait InterpMethods {
-    /// Validate data stored in [Self]. By design, [Self] can be instantiatated
-    /// only via the `new` method, which calls `validate`.
+    /// Validate data stored in [Self]
     fn validate(&self) -> Result<(), ValidationError>;
-    /// Interpolate at given point
+    /// Interpolate at supplied point
     fn interpolate(&self, point: &[f64]) -> Result<f64, InterpolationError>;
 }