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-rw-r--r--Doc/c-api/arg.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/c-api/arg.rst b/Doc/c-api/arg.rst
index f34e4b4..4774861 100644
--- a/Doc/c-api/arg.rst
+++ b/Doc/c-api/arg.rst
@@ -136,7 +136,7 @@ of the C variable(s) whose address should be passed.
In both cases, *\*buffer_length* is set to the length of the encoded data
without the trailing NUL byte.
-``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer]
+``et#`` (string, Unicode object or character buffer compatible object) [const char \*encoding, char \*\*buffer, int \*buffer_length]
Same as ``es#`` except that string objects are passed through without
recoding them. Instead, the implementation assumes that the string object
uses the encoding passed in as parameter.