diff --git a/doc/requirements.txt b/doc/requirements.txt
index ddf8411..90ae115 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -9,3 +9,6 @@
 
 # releasenotes
 reno>=2.5.0 # Apache-2.0
+
+# PDF Docs
+sphinxcontrib-svg2pdfconverter>=0.1.0 # BSD