From 06086a9ff75ecc5f9372d4c34dfc69d8190a6873 Mon Sep 17 00:00:00 2001
From: ToruNiina <niina.toru.68u@gmail.com>
Date: Wed, 9 Oct 2019 21:09:38 +0900
Subject: [PATCH] doc: add note about value::at

---
 README.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/README.md b/README.md
index 222de08..9248db4 100644
--- a/README.md
+++ b/README.md
@@ -470,6 +470,10 @@ If an invalid key (integer for a table, string for an array), it throws
 `toml::type_error` for the conversion. If the provided key is out-of-range,
 it throws `std::out_of_range`.
 
+Note that, although `std::string` has `at()` member function, `toml::value::at`
+throws if the contained type is a string. Because `std::string` does not
+contain `toml::value`.
+
 ## Checking value type
 
 You can check the type of a value by `is_xxx` function.