diff --git a/src/calibre/library/catalogs/epub_mobi.py b/src/calibre/library/catalogs/epub_mobi.py
index 4984fbf9e2..673d764593 100644
--- a/src/calibre/library/catalogs/epub_mobi.py
+++ b/src/calibre/library/catalogs/epub_mobi.py
@@ -149,7 +149,7 @@ class EPUB_MOBI(CatalogPlugin):
                           default=None,
                           dest='output_profile',
                           action=None,
-                          help=_("Specifies the output profile.  In some cases, an output profile is required to optimize the catalog for the device.  For example, 'kindle' or 'kindle_dx' creates a structured Table of Contents with Sections and Articles.\n"
+                          help=_("Specifies the output profile. In some cases, an output profile is required to optimize the catalog for the device.  For example, 'kindle' or 'kindle_dx' creates a structured Table of Contents with Sections and Articles.\n"
                           "Default: '%default'\n"
                           "Applies to: AZW3, ePub, MOBI output formats")),
                    Option('--prefix-rules',