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-rw-r--r--doc/ref/api-io.texi2
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index 9b5276609..24c2706df 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -129,7 +129,7 @@ this fluid otherwise.
@end defvr
@deffn {Scheme Procedure} port-encoding port
-@deffnx {C Function} scm_port_encoding
+@deffnx {C Function} scm_port_encoding (port)
Returns, as a string, the character encoding that @var{port} uses to interpret
its input and output. The value @code{#f} is equivalent to @code{"ISO-8859-1"}.
@end deffn