diff --git a/manual/faq.rst b/manual/faq.rst
index 3dc1c4b88c..6199641d49 100644
--- a/manual/faq.rst
+++ b/manual/faq.rst
@@ -25,7 +25,7 @@ It can convert every input format in the following list, to every output format.
 .. note ::
 
     PRC is a generic format, calibre supports PRC files with TextRead and MOBIBook headers.
-    PDB is also a generic format. calibre supports eReader, Plucker, PML and zTxt PDB files.
+    PDB is also a generic format. calibre supports eReader, Plucker (input only), PML and zTxt PDB files.
     DJVU support is only for converting DJVU files that contain embedded text. These are typically generated by OCR software.
     MOBI books can be of two types Mobi6 and KF8. calibre fully supports both. MOBI files often have .azw or .azw3 file extensions.
     DOCX files from Microsoft Word 2007 and newer are supported.