diff --git a/modules/ROOT/pages/functions/mathematical-trigonometric.adoc b/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
index a4c3aaf86..62068e864 100644
--- a/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
+++ b/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
@@ -345,6 +345,7 @@ The cotangent of `0.5` is returned.
 
 | `coth(null)` returns `null`.
 | `coth(0)` returns `NaN`.
+| The calculation of the hyperbolic cotangent, `coth(x)`, is done using the `cosh(x) / sinh(x)` method.
 
 |===