diff --git a/Doc/c-api/buffer.rst b/Doc/c-api/buffer.rst
index 8c2de9691f..b871e622db 100644
--- a/Doc/c-api/buffer.rst
+++ b/Doc/c-api/buffer.rst
@@ -473,6 +473,14 @@ Buffer-related functions
    (*order* is ``'A'``).  Return ``0`` otherwise.
 
 
+.. c:function:: int PyBuffer_ToContiguous(void *buf, Py_buffer *src, Py_ssize_t len, char order)
+
+   Copy *src* to its contiguous representation in *buf* with length *len*.
+   *order* can be ``'C'`` or ``'F'``.
+
+   The function fails if *len* != *src->len*.
+
+
 .. c:function:: void PyBuffer_FillContiguousStrides(int ndims, Py_ssize_t *shape, Py_ssize_t *strides, int itemsize, char order)
 
    Fill the *strides* array with byte-strides of a :term:`contiguous` (C-style if