From a87b55900d6c60e9bf76b61fb31efc07078f147b Mon Sep 17 00:00:00 2001
From: Ed Page <eopage@gmail.com>
Date: Mon, 2 Jan 2023 22:36:52 -0600
Subject: [PATCH] doc(derive): Clarify default_value_t reqs

Fixes #4599
---
 src/_derive/mod.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/_derive/mod.rs b/src/_derive/mod.rs
index b09cdf6b890..a92b7c87b04 100644
--- a/src/_derive/mod.rs
+++ b/src/_derive/mod.rs
@@ -232,7 +232,8 @@
 //!   - Without `<expr>`: fills the field with `Default::default()`
 //! - `default_value = <str>`: [`Arg::default_value`][crate::Arg::default_value] and [`Arg::required(false)`][crate::Arg::required]
 //! - `default_value_t [= <expr>]`: [`Arg::default_value`][crate::Arg::default_value] and [`Arg::required(false)`][crate::Arg::required]
-//!   - Requires `std::fmt::Display` or `#[arg(value_enum)]`
+//!   - Requires `std::fmt::Display` that roundtrips correctly with the
+//!     [`Arg::value_parser`][crate::Arg::value_parser] or `#[arg(value_enum)]`
 //!   - Without `<expr>`, relies on `Default::default()`
 //! - `default_values_t = <expr>`: [`Arg::default_values`][crate::Arg::default_values] and [`Arg::required(false)`][crate::Arg::required]
 //!   - Requires field arg to be of type `Vec<T>` and `T` to implement `std::fmt::Display` or `#[arg(value_enum)]`