diff --git a/manual/edit.rst b/manual/edit.rst
index 661d4943e7..f3fd4860c8 100644
--- a/manual/edit.rst
+++ b/manual/edit.rst
@@ -378,7 +378,7 @@ when single quotes at the start of contractions are involved. Accessed via
 Transforming CSS properties
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-Create rules to transform the stying of the book. For example, create a rule
+Create rules to transform the styling of the book. For example, create a rule
 to convert all red text to green or to double the font size of all text in the
 book or make text of a certain font family italic, etc.
 
diff --git a/src/calibre/gui2/css_transform_rules.py b/src/calibre/gui2/css_transform_rules.py
index 3c1c7347db..810604830b 100644
--- a/src/calibre/gui2/css_transform_rules.py
+++ b/src/calibre/gui2/css_transform_rules.py
@@ -93,7 +93,7 @@ class RuleEdit(QWidget):  # {{{
         if 'matches' in mt:
             tt = _('A regular expression')
         elif mt in '< > <= >='.split():
-            tt = _('Either a CSS length, such as 10pt or a unit less number. If a unitless'
+            tt = _('Either a CSS length, such as 10pt or a unit less number. If a unit less'
                    ' number is used it will be compared with the CSS value using whatever unit'
                    ' the value has. Note that comparison automatically converts units, except'
                    ' for relative units like percentage or em, for which comparison fails'