diff --git a/doc/requirements.txt b/doc/requirements.txt
index 9ba0c5a6483033f7c1416bf8ad8061ef488958b9..d8c23bf1f819ef820f6befc869ef6bd58e3d68d4 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -4,3 +4,4 @@ numpy>=1.20.3
 #scipy>=1.7.1
 #matplotlib>=3.4.3
 #numpydoc
+deepCR
\ No newline at end of file