diff --git a/doc/sphinxext/related_software.txt b/doc/sphinxext/related_software.txt
index 3bc9b73033d..8e282e64d96 100644
--- a/doc/sphinxext/related_software.txt
+++ b/doc/sphinxext/related_software.txt
@@ -28,6 +28,7 @@ niseq
 nitime
 pactools
 plotly
+pybispectra
 pybvrf
 pycrostates
 pyprep