diff --git a/docs/functions/hrv.rst b/docs/functions/hrv.rst
index fc316cbb2a..429ec4c73c 100644
--- a/docs/functions/hrv.rst
+++ b/docs/functions/hrv.rst
@@ -30,6 +30,9 @@ Sub-domains
 """"""""""""""""""
 .. autofunction:: neurokit2.hrv.hrv_rqa
 
+*hrv_symdyn()*
+""""""""""""""""""
+.. autofunction:: neurokit2.hrv.hrv_symdyn
 
 Intervals
 ^^^^^^^^^^^^^^^^