diff --git a/lib/growth/calc/centile.ex b/lib/growth/calc/centile.ex
index d06342f..5ae7ea2 100644
--- a/lib/growth/calc/centile.ex
+++ b/lib/growth/calc/centile.ex
@@ -25,10 +25,9 @@ defmodule Growth.Calc.Centile do
 
   @spec compute(number(), ZScore.l(), ZScore.m(), ZScore.s()) :: number() | :na
   @doc """
-  Compute the centile for a given measurement (`y`) and the Box-Cox values: power (`l`), median (`m`), and
-  coefficient of variation (`s`).
+  Compute the measurement value for a given z-score and the Box-Cox values: power (`l`), median (`m`), and coefficient of variation (`s`).
 
-  Returns the centile based on the z-score when -3 <= z-score <= 3; otherwise, returns `:na.`
+  Returns the measurement based on the z-score when -3 <= z-score <= 3; otherwise, `:na.`
 
   ## Examples: