diff --git a/src/calibre/ebooks/conversion/plugins/pdf_input.py b/src/calibre/ebooks/conversion/plugins/pdf_input.py
index 20cc20d687..0342b3b218 100644
--- a/src/calibre/ebooks/conversion/plugins/pdf_input.py
+++ b/src/calibre/ebooks/conversion/plugins/pdf_input.py
@@ -23,7 +23,7 @@ class PDFInput(InputFormatPlugin):
             'be unwrapped. Valid values are a decimal between 0 and 1. The '
             'default is 0.45, just below the median line length.')),
         OptionRecommendation(name='new_pdf_engine', recommended_value=False,
-            help=_('Use the new PDF conversion engine.'))
+            help=_('Use the new PDF conversion engine. Currently not operational.'))
     ])
 
     def convert_new(self, stream, accelerators):