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-rw-r--r--doc/api.texi4
1 files changed, 4 insertions, 0 deletions
diff --git a/doc/api.texi b/doc/api.texi
index f5a2400..32a797b 100644
--- a/doc/api.texi
+++ b/doc/api.texi
@@ -429,6 +429,10 @@ approximation that is ``good enough.''
Half of @var{pi}.
@end defvar
+@deffn {Procedure} cotan @var{z}
+Return the cotangent of @var{z}.
+@end deffn
+
@node Vectors
@subsection Vectors