diff --git a/activestorage/lib/active_storage/previewer.rb b/activestorage/lib/active_storage/previewer.rb
index fb202f029a821..95a041fd1621c 100644
--- a/activestorage/lib/active_storage/previewer.rb
+++ b/activestorage/lib/active_storage/previewer.rb
@@ -2,8 +2,8 @@
 
 module ActiveStorage
   # This is an abstract base class for previewers, which generate images from blobs. See
-  # ActiveStorage::Previewer::PDFPreviewer and ActiveStorage::Previewer::VideoPreviewer for examples of
-  # concrete subclasses.
+  # ActiveStorage::Previewer::MuPDFPreviewer and ActiveStorage::Previewer::VideoPreviewer for
+  # examples of concrete subclasses.
   class Previewer
     attr_reader :blob