From 3d1b16691122adbc1742c326c95c873dfd0d0042 Mon Sep 17 00:00:00 2001
From: Heiko Schaefer <heiko@schaefer.name>
Date: Thu, 26 Aug 2021 20:40:36 +0200
Subject: [PATCH] Add comments

---
 openpgp-card/src/apdu/command.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/openpgp-card/src/apdu/command.rs b/openpgp-card/src/apdu/command.rs
index 8494b10..fe5886c 100644
--- a/openpgp-card/src/apdu/command.rs
+++ b/openpgp-card/src/apdu/command.rs
@@ -22,7 +22,13 @@ pub(crate) struct Command {
 }
 
 impl Command {
+    /// Create an APDU Command.
+    ///
+    /// `data` must be smaller than 64 kbyte. If a larger `data` is passed,
+    /// this fn will panic.
     pub fn new(cla: u8, ins: u8, p1: u8, p2: u8, data: Vec<u8>) -> Self {
+        // This constructor is the only place it gets set, so it's
+        // sufficient to check it here.
         assert!(data.len() < 0x10000, "'data' too big, must be <64 kbyte");
 
         Command {