From 6010cd390fc3ecd278207d6f3df0cd83fea257f3 Mon Sep 17 00:00:00 2001
From: Guillaume Gomez <guillaume1.gomez@gmail.com>
Date: Sun, 25 May 2025 15:49:11 +0200
Subject: [PATCH] Add documentation for mutable variables

---
 book/src/template_syntax.md | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/book/src/template_syntax.md b/book/src/template_syntax.md
index 24c2dd4b..b0494063 100644
--- a/book/src/template_syntax.md
+++ b/book/src/template_syntax.md
@@ -63,6 +63,15 @@ Like Rust, Askama also supports shadowing variables.
 {{ foo }}
 ```
 
+You can declare variables as mutable with the `mut` keyword:
+
+```jinja
+{# In this example, `foo` is an iterator. If you want to be able to iterate it,
+you need it to be mutable #}
+{% let mut foo = [1, 2].iter() %}
+{{ foo.next().unwrap() }}
+```
+
 For compatibility with Jinja, `set` can be used in place of `let`.
 
 ### Borrow rules