diff --git a/requirements.in b/requirements.in
index bb3639e..61336f6 100644
--- a/requirements.in
+++ b/requirements.in
@@ -8,3 +8,4 @@ sphinxcontrib.images
 sphinxcontrib.video 
 sphinxcontrib.htmlhelp
 sphinxcontrib.wavedrom 
+sphinxcontrib.mermaid 
\ No newline at end of file