diff --git a/doc/api.rst b/doc/api.rst
index 1435cca1..4d09ecb6 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -157,7 +157,7 @@ Output iterator support
 -----------------------
 
 .. doxygenfunction:: fmt::format_to(OutputIt, string_view, const Args&...)
-.. doxygenfunction:: fmt::format_to_n(OutputIt, size_t, string_view, const Args&...)
+.. doxygenfunction:: fmt::format_to_n(OutputIt, std::size_t, string_view, const Args&...)
 .. doxygenstruct:: fmt::format_to_n_result
    :members:
 
diff --git a/include/fmt/format.h b/include/fmt/format.h
index eb0db49c..5e951f5a 100644
--- a/include/fmt/format.h
+++ b/include/fmt/format.h
@@ -3458,6 +3458,7 @@ auto join(const Range &range, wstring_view sep)
 /**
   \rst
   Converts *value* to ``std::string`` using the default format for type *T*.
+  It doesn't support user-defined types with custom formatters.
 
   **Example**::