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-rw-r--r--doc/ref/api-io.texi1
1 files changed, 1 insertions, 0 deletions
diff --git a/doc/ref/api-io.texi b/doc/ref/api-io.texi
index a0619df05..f1170eb2c 100644
--- a/doc/ref/api-io.texi
+++ b/doc/ref/api-io.texi
@@ -2131,6 +2131,7 @@ index @var{start} and limiting to @var{count} octets.
@deffn {Scheme Procedure} put-char port char
Writes @var{char} to the port. The @code{put-char} procedure returns
+an unspecified value.
@end deffn
@deffn {Scheme Procedure} put-string port string