From 96a404acfcd628bc23279df1d95698c111b22a02 Mon Sep 17 00:00:00 2001
From: Akshay <nerdy@peppe.rs>
Date: Thu, 4 Nov 2021 22:00:13 +0530
Subject: add missing explanation to deprecated_is_null

---
 lib/src/lints/deprecated_is_null.rs | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/src/lints/deprecated_is_null.rs b/lib/src/lints/deprecated_is_null.rs
index 99fb3fb..fce6931 100644
--- a/lib/src/lints/deprecated_is_null.rs
+++ b/lib/src/lints/deprecated_is_null.rs
@@ -7,6 +7,25 @@ use rnix::{
     NodeOrToken, SyntaxElement, SyntaxKind,
 };
 
+/// ## What it does
+/// Checks for usage of the `isNull` function.
+///
+/// ## Why is this bad?
+/// `isNull` is deprecated.
+///
+/// ## Example
+///
+/// Instead of `isNull` for `null` checks,
+///
+/// ```nix
+/// isNull e
+/// ```
+///
+/// use the equality operator:
+///
+/// ```nix
+/// e == null
+/// ```
 #[lint(
     name = "deprecated isNull",
     note = "Found usage of deprecated builtin isNull",
-- 
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