diff --git a/Changelog.txt b/Changelog.txt
index 4d08d85eed..51dca45e91 100644
--- a/Changelog.txt
+++ b/Changelog.txt
@@ -37,7 +37,7 @@
 
   Turn it on via the PDF input section of the conversion dialog.
 
-- Content server: Viewer: Read Aloud: Implement word-by-word tracking when reading aloud if the browser and voice used support it, for example, Chromium on Windows, Firefox on Android and Safari on macOS
+- Content server: Viewer: Read Aloud: Implement word-by-word tracking when reading aloud if the browser and OS used support it, for example, Chromium on Windows, Firefox on Android and Safari on macOS
 
 - [2080315] Image popup: Add a context menu with an option to reset the current zoom
 
diff --git a/src/calibre/db/cache.py b/src/calibre/db/cache.py
index d28d1f4558..a0fb1c5978 100644
--- a/src/calibre/db/cache.py
+++ b/src/calibre/db/cache.py
@@ -947,7 +947,7 @@ class Cache:
 
     @read_api
     def get_item_id(self, field, item_name):
-        '''' Return the item id for item_name (case-insensitive) or None if not found.
+        ''' Return the item id for item_name (case-insensitive) or None if not found.
         This function is very slow if doing lookups for multiple names use either get_item_ids() or get_item_name_map(). '''
         q = icu_lower(item_name)
         try:
diff --git a/src/calibre/ebooks/conversion/plugins/pdf_input.py b/src/calibre/ebooks/conversion/plugins/pdf_input.py
index d9b3dc494c..2408f79b58 100644
--- a/src/calibre/ebooks/conversion/plugins/pdf_input.py
+++ b/src/calibre/ebooks/conversion/plugins/pdf_input.py
@@ -26,7 +26,7 @@ class PDFInput(InputFormatPlugin):
         OptionRecommendation(name='new_pdf_engine', recommended_value=False,
             help=_('Use the new, experimental, PDF conversion engine.')),
         OptionRecommendation(name='pdf_header_skip', recommended_value=-1,
-            help=_('Skip everything to the specified number pixels at the top of a page.'
+            help=_('Skip everything to the specified number of pixels at the top of a page.'
             ' Negative numbers mean auto-detect and remove headers, zero means do not remove headers and positive numbers'
             ' mean remove headers that appear above that many pixels from the top of the page. Works only'
             ' with the new PDF engine.'
diff --git a/src/calibre/utils/formatter_functions.py b/src/calibre/utils/formatter_functions.py
index 6350b9976d..e8a945ce65 100644
--- a/src/calibre/utils/formatter_functions.py
+++ b/src/calibre/utils/formatter_functions.py
@@ -2576,7 +2576,7 @@ class BuiltinGetNote(BuiltinFormatterFunction):
     category = 'Template database functions'
     __doc__ = doc = _("get_note(field_name, field_value, plain_text) -- fetch the "
                       "note for field 'field_name' with value 'field_value'. If "
-                      "'plain_text' is empty, return the note's HTML including"
+                      "'plain_text' is empty, return the note's HTML including "
                       "images. If 'plain_text' is 1 (or '1'), return the "
                       "note's plain text. If the note doesn't exist, return the "
                       "empty string in both cases. Example: "