From f0ae725721d766842dde88ed70ac8bea6085b36f Mon Sep 17 00:00:00 2001
From: Victor Zverovich <viz@fb.com>
Date: Wed, 9 May 2018 06:43:54 -0700
Subject: [PATCH] Clarify the use of allocators

---
 doc/api.rst | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/api.rst b/doc/api.rst
index 1e1237f4..9372743f 100644
--- a/doc/api.rst
+++ b/doc/api.rst
@@ -200,6 +200,11 @@ allocator::
       return vformat(alloc, format_str, fmt::make_format_args(args...));
     }
 
+The allocator will be used for the output container only. If you are using named
+arguments, the container that stores pointers to them will be allocated using
+the default allocator. Also floating-point formatting falls back on ``sprintf``
+which may do allocations.
+
 Custom formatting of built-in types
 -----------------------------------