From 862d3b7684f170a85082b511bcc30f9d600b4f50 Mon Sep 17 00:00:00 2001
From: Laurenz <laurmaedje@gmail.com>
Date: Mon, 27 Mar 2023 22:54:21 +0200
Subject: [PATCH] Methods can be impure

Fixes #385.
---
 docs/src/reference/types.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/src/reference/types.md b/docs/src/reference/types.md
index b87b07790..c323ab41d 100644
--- a/docs/src/reference/types.md
+++ b/docs/src/reference/types.md
@@ -822,6 +822,10 @@ In Typst, all functions are _pure._ This means that for the same
 arguments, they always return the same result. They cannot "remember" things to
 produce another value when they are called a second time.
 
+The only exception are built-in methods like
+[`array.push(value)`]($type/array.push). These can modify the values they are
+called on.
+
 ## Methods
 ### with()
 Returns a new function that has the given arguments pre-applied.