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-rw-r--r--doc/apiref.rst4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/apiref.rst b/doc/apiref.rst
index 1b305f5..3c4fa47 100644
--- a/doc/apiref.rst
+++ b/doc/apiref.rst
@@ -1091,7 +1091,9 @@ These functions output UTF-8:
Returns the JSON representation of *json* as a string, or *NULL* on
error. *flags* is described above. The return value must be freed
- by the caller using :func:`free()`.
+ by the caller using :func:`free()`. Note that if you have called
+ :func:`json_set_alloc_funcs()` to override :func:`free()`, you should
+ call your custom free function instead to free the return value.
.. function:: size_t json_dumpb(const json_t *json, char *buffer, size_t size, size_t flags)