From 6a99c18c304cd199950bf32d9b9cb07c0276f0b7 Mon Sep 17 00:00:00 2001
From: Robert Hensing <robert@roberthensing.nl>
Date: Mon, 15 Jan 2024 08:18:53 +0100
Subject: [PATCH] doc/glossary: Define impure derivation

---
 doc/manual/src/glossary.md | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/doc/manual/src/glossary.md b/doc/manual/src/glossary.md
index 4507d8bf3..46cc5926c 100644
--- a/doc/manual/src/glossary.md
+++ b/doc/manual/src/glossary.md
@@ -156,6 +156,11 @@
   builder can rely on external inputs such as the network or the
   system time) but the Nix model assumes it.
 
+- [impure derivation]{#gloss-impure-derivation}
+
+  [An experimental feature](#@docroot@/contributing/experimental-features.md#xp-feature-impure-derivations) that allows derivations to be explicitly marked as impure,
+  so that they are always rebuilt, and their outputs not reused by subsequent calls to realise them.
+
 - [Nix database]{#gloss-nix-database}
 
   An SQlite database to track [reference]s between [store object]s.