diff --git a/doc/api.rst b/doc/api.rst
index 4b4b9b5fba9d..e132bd266815 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -73,7 +73,7 @@ specified otherwise.
 
 .. _format:
 
-.. doxygenfunction:: format_to(OutputIt out, format_string<T...> fmt, T&&... args) -> OutputIt
+.. doxygenfunction:: format_to(OutputIt&& out, format_string<T...> fmt, T&&... args) -> remove_cvref_t<OutputIt>
 .. doxygenfunction:: format_to_n(OutputIt out, size_t n, format_string<T...> fmt, T&&... args) -> format_to_n_result<OutputIt>
 .. doxygenfunction:: formatted_size(format_string<T...> fmt, T&&... args) -> size_t