diff --git a/maintainers/working_groups/learning_journey/documentation-survey.md b/maintainers/working_groups/learning_journey/documentation-survey.md
index 7aa5f04b9..64ff8d2b5 100644
--- a/maintainers/working_groups/learning_journey/documentation-survey.md
+++ b/maintainers/working_groups/learning_journey/documentation-survey.md
@@ -172,8 +172,14 @@ To better navigate the material and judge its relevance, every entry should prov
     Relates deployment issues to memory management issues in programming languages. Relates files to objects in memory. Describes closures, discusses pointer discipline and conservative garbage collection, shows that persistence is achieved by cryptographic hashes.
 
   - Reading time: 25 min
+        
+  Chapter 4:
+    The Nix language: Functional languages; lazy languages. Lexical syntax of Nix language. Semantics: Basic and compound values, substitutions, function calls, conditionals, assertions, `with`, operators, evaluation rules. Implementation using ATerm library.
+
+  - Reading time: 60 min
     
 
+
 ### Nixpkgs
 
 - [Nix Pills Chapter 6: Our First Derivation](https://nixos.org/guides/nix-pills/our-first-derivation.html)