diff --git a/src/pyj/read_book/iframe.pyj b/src/pyj/read_book/iframe.pyj
index 695dc2dab4..11a7e5ff90 100644
--- a/src/pyj/read_book/iframe.pyj
+++ b/src/pyj/read_book/iframe.pyj
@@ -280,6 +280,8 @@ class IframeBoss:
 
     def change_number_of_columns(self, data):
         if current_layout_mode() is 'flow':
+            self.send_message('error', title=_('In flow mode'), msg=_(
+                'Cannot change number of pages per screen in flow mode, switch to paged mode first.'))
             return
         cdata = get_columns_per_screen_data()
         delta = int(data.delta)
diff --git a/src/pyj/read_book/shortcuts.pyj b/src/pyj/read_book/shortcuts.pyj
index 437ca8d6af..8316be03a6 100644
--- a/src/pyj/read_book/shortcuts.pyj
+++ b/src/pyj/read_book/shortcuts.pyj
@@ -219,19 +219,19 @@ def shortcuts_definition():
     'increase_number_of_columns': desc(
         v"['Ctrl+]']",
         'ui',
-        _('Increase number of columns'),
+        _('Increase number of pages per screen'),
     ),
 
     'decrease_number_of_columns': desc(
         v"['Ctrl+[']",
         'ui',
-        _('Decrease number of columns'),
+        _('Decrease number of pages per screen'),
     ),
 
     'reset_number_of_columns': desc(
         v"['Ctrl+Alt+c']",
         'ui',
-        _('Make number of columns automatic'),
+        _('Make number of pages per screen automatic'),
     ),
 
     'toggle_full_screen': desc(