diff --git a/README.md b/README.md
index e292593..f12281b 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Things you may want to cover:
 
 ## System dependencies
 
-- poppler (PDF rendering libary)
+- muPDF or poppler (PDF rendering libary)
 - vips (Image processing libary)
 
 ## Configuration