From 5ce6bf01571baa833280f8823d23454f2c4bf9ff Mon Sep 17 00:00:00 2001
From: "piotr.idzik" <vil02@o2.pl>
Date: Mon, 30 Jan 2023 21:38:36 +0100
Subject: [PATCH] docs: explain usage of standard headers

---
 data_structures/avltree.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/data_structures/avltree.cpp b/data_structures/avltree.cpp
index 4efd1207c..251f3606c 100644
--- a/data_structures/avltree.cpp
+++ b/data_structures/avltree.cpp
@@ -6,9 +6,9 @@
  * \warning This program is a poor implementation and does not utilize any of
  * the C++ STL features.
  */
-#include <algorithm>
-#include <iostream>
-#include <queue>
+#include <algorithm>  // for std::max
+#include <iostream>   // for std::cout
+#include <queue>      // for std::queue
 
 using node = struct node {
     int data;