diff --git a/doc/lib.txt b/doc/lib.txt
index 85f819961..76920c6a9 100644
--- a/doc/lib.txt
+++ b/doc/lib.txt
@@ -185,7 +185,7 @@ Math libraries
 * `complex <complex.html>`_
   This module implements complex numbers and their mathematical operations.
 
-* `rational <rational.html>`_
+* `rationals <rationals.html>`_
   This module implements rational numbers and their mathematical operations.
 
 * `fenv <fenv.html>`_