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-rw-r--r--docs/library/ubinascii.rst8
1 files changed, 7 insertions, 1 deletions
diff --git a/docs/library/ubinascii.rst b/docs/library/ubinascii.rst
index c4825c204..e7967c511 100644
--- a/docs/library/ubinascii.rst
+++ b/docs/library/ubinascii.rst
@@ -10,10 +10,16 @@ encodings of it in ASCII form (in both directions).
Functions
---------
-.. function:: hexlify(data)
+.. function:: hexlify(data, [sep])
Convert binary data to hexadecimal representation. Return bytes string.
+ .. admonition:: Difference to CPython
+ :class: attention
+
+ If additional argument, `sep` is supplied, it is used as a seperator
+ between hexadecimal values.
+
.. function:: unhexlify(data)
Convert hexadecimal data to binary representation. Return bytes string.