diff --git a/src/calibre/ebooks/metadata/sources/base.py b/src/calibre/ebooks/metadata/sources/base.py
index ea659906a9..562d9b7ea6 100644
--- a/src/calibre/ebooks/metadata/sources/base.py
+++ b/src/calibre/ebooks/metadata/sources/base.py
@@ -497,7 +497,7 @@ class Source(Plugin):
 
     def get_book_urls(self, identifiers):
         '''
-        Override this method if you would like to return multiple urls for this book.
+        Override this method if you would like to return multiple URLs for this book.
         Return a list of 3-tuples. By default this method simply calls :func:`get_book_url`.
         '''
         data = self.get_book_url(identifiers)
diff --git a/src/calibre/gui2/comments_editor.py b/src/calibre/gui2/comments_editor.py
index 0aae628075..19225ef03b 100644
--- a/src/calibre/gui2/comments_editor.py
+++ b/src/calibre/gui2/comments_editor.py
@@ -680,7 +680,7 @@ class EditorWidget(QTextEdit, LineEditECM):  # {{{
 
         else:
             error_dialog(self, _('Invalid URL'),
-                         _('The url %r is invalid') % link, show=True)
+                         _('The URL %r is invalid') % link, show=True)
 
     def ask_link(self):
 
diff --git a/src/calibre/web/feeds/news.py b/src/calibre/web/feeds/news.py
index 52a6555f7a..699d75650b 100644
--- a/src/calibre/web/feeds/news.py
+++ b/src/calibre/web/feeds/news.py
@@ -335,7 +335,7 @@ class BasicNewsRecipe(Recipe):
     '''
 
     #: By default, calibre will use a default image for the masthead (Kindle only).
-    #: Override this in your recipe to provide a url to use as a masthead.
+    #: Override this in your recipe to provide a URL to use as a masthead.
     masthead_url = None
 
     #: By default, the cover image returned by get_cover_url() will be used as