diff --git a/src/calibre/ebooks/oeb/polish/main.py b/src/calibre/ebooks/oeb/polish/main.py
index c04686ed6c..7ec34b5174 100644
--- a/src/calibre/ebooks/oeb/polish/main.py
+++ b/src/calibre/ebooks/oeb/polish/main.py
@@ -43,8 +43,8 @@
 changes needed for the desired effect.</p>
 
 <p>You should use this tool as the last step in your ebook creation process.</p>
-
-<p>Note that polishing only works on files in the %s formats.</p>
+{0}
+<p>Note that polishing only works on files in the %s formats.</p>\
 ''')%_(' or ').join('<b>%s</b>'%x for x in SUPPORTED),
 
 'subset': _('''\
@@ -69,7 +69,7 @@
 'jacket': _('''\
 <p>Insert a "book jacket" page at the start of the book that contains
 all the book metadata such as title, tags, authors, series, comments,
-etc.</p>'''),
+etc. Any previous book jacket will be replaced.</p>'''),
 
 'remove_jacket': _('''\
 <p>Remove a previous inserted book jacket page.</p>
@@ -85,7 +85,7 @@
 
 def hfix(name, raw):
     if name == 'about':
-        return raw
+        return raw.format('')
     raw = raw.replace('\n\n', '__XX__')
     raw = raw.replace('\n', ' ')
     raw = raw.replace('__XX__', '\n')
diff --git a/src/calibre/gui2/actions/polish.py b/src/calibre/gui2/actions/polish.py
index 127749cc51..5aecbd2d87 100644
--- a/src/calibre/gui2/actions/polish.py
+++ b/src/calibre/gui2/actions/polish.py
@@ -37,7 +37,13 @@ def __init__(self, db, book_id_map, parent=None):
         self.setWindowTitle(title)
 
         self.help_text = {
-            'polish': _('<h3>About Polishing books</h3>%s')%HELP['about'],
+            'polish': _('<h3>About Polishing books</h3>%s')%HELP['about'].format(
+                _('''<p>If you have both EPUB and ORIGINAL_EPUB in your book,
+                  then polishing will run on ORIGINAL_EPUB (the same for other
+                  ORIGINAL_* formats).  So if you
+                  want Polishing to not run on the ORIGINAL_* format, delete the
+                  ORIGINAL_* format before running it.</p>''')
+            ),
 
             'subset':_('<h3>Subsetting fonts</h3>%s')%HELP['subset'],