diff --git a/doc/genomedata.rst b/doc/genomedata.rst
index 61c0791..08f7946 100755
--- a/doc/genomedata.rst
+++ b/doc/genomedata.rst
@@ -376,7 +376,7 @@ format and the bigWig file format:
   filename of the bigWig.
 - Summary statistics are taken from the bigWig file formation definition
   which are stored as integers. There may be some differences precision.
-- Each :class:`Chromosomes <Chromosome>` is represented with 1 underlying
+- Each :class:`Chromosome <Chromosome>` is represented with 1 underlying
   :class:`Supercontigs <Supercontig>`.