diff --git a/Lib/StringIO.py b/Lib/StringIO.py
index 1e5f25408d7..232009fb939 100644
--- a/Lib/StringIO.py
+++ b/Lib/StringIO.py
@@ -137,7 +137,7 @@ class StringIO:
         return r
 
     def readline(self, length=None):
-        """Read one entire line from the file.
+        r"""Read one entire line from the file.
 
         A trailing newline character is kept in the string (but may be absent
         when a file ends with an incomplete line). If the size argument is
diff --git a/Lib/difflib.py b/Lib/difflib.py
index 3e28b18bf42..d1c29318a6d 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -1311,7 +1311,7 @@ def ndiff(a, b, linejunk=None, charjunk=IS_CHARACTER_JUNK):
 
 def _mdiff(fromlines, tolines, context=None, linejunk=None,
            charjunk=IS_CHARACTER_JUNK):
-    """Returns generator yielding marked up from/to side by side differences.
+    r"""Returns generator yielding marked up from/to side by side differences.
 
     Arguments:
     fromlines -- list of text lines to compared to tolines