diff --git a/doc/.rtd_requirements.txt b/doc/.rtd_requirements.txt
index d667fece34111f8f274488b61e49157376cc6ea7..1bcc85802ca564186cb0f43e54623a38376a6959 100644
--- a/doc/.rtd_requirements.txt
+++ b/doc/.rtd_requirements.txt
@@ -3,4 +3,5 @@ pyyaml
 matplotlib
 scipy
 seaborn
-uproot
\ No newline at end of file
+uproot
+sphinx-argparse