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diff --git a/Doc/reference/lexical_analysis.rst b/Doc/reference/lexical_analysis.rst
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@@ -560,6 +560,10 @@ is more easily recognized as broken.) It is also important to note that the
escape sequences only recognized in string literals fall into the category of
unrecognized escapes for bytes literals.
+ .. versionchanged:: 3.6
+ Unrecognized escape sequences produce a DeprecationWarning. In
+ some future version of Python they will be a SyntaxError.
+
Even in a raw literal, quotes can be escaped with a backslash, but the
backslash remains in the result; for example, ``r"\""`` is a valid string
literal consisting of two characters: a backslash and a double quote; ``r"\"``