From fe8ec1c045af7a41492d0df6d271f1ce56afb51b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?L=C3=BAc=C3=A1s=20Meier?= <cronokirby@gmail.com>
Date: Fri, 4 Oct 2019 11:03:35 +0200
Subject: [#1807] Add entry in docs/user/features

---
 docs/user/features.md | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

(limited to 'docs')

diff --git a/docs/user/features.md b/docs/user/features.md
index eb81cba26..f89d8c489 100644
--- a/docs/user/features.md
+++ b/docs/user/features.md
@@ -166,6 +166,20 @@ impl Foo for S {
 }
 ```
 
+- Apply [De Morgan's law](https://en.wikipedia.org/wiki/De_Morgan%27s_laws)
+
+```rust
+// before:
+fn example(x: bool) -> bool {
+    !x || !x
+}
+
+// after:
+fn example(x: bool) -> bool {
+    !(x && !x)
+}
+```
+
 - Import path
 
 ```rust
-- 
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