diff --git a/modules/ROOT/pages/functions/mathematical-trigonometric.adoc b/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
index a4c3aaf86..1c7978af0 100644
--- a/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
+++ b/modules/ROOT/pages/functions/mathematical-trigonometric.adoc
@@ -331,6 +331,8 @@ The cotangent of `0.5` is returned.
 [[functions-coth]]
 == coth()
 
+The calculation of the hyperbolic cotangent, `coth(x)`, is done using the `cosh(x) / sinh(x)` method.
+
 .Details
 |===
 | *Syntax* 3+| `coth(input)`