diff --git a/maintainers/working_groups/learning_journey/documentation-survey.md b/maintainers/working_groups/learning_journey/documentation-survey.md
index 176b09c..ebb279e 100644
--- a/maintainers/working_groups/learning_journey/documentation-survey.md
+++ b/maintainers/working_groups/learning_journey/documentation-survey.md
@@ -1,9 +1,24 @@
 # Documentation survey
 
+To better navigate the material and judge its relevance, every entry should provide
+  - Title (URL)
+  - Brief summary
+  - Video length or estimated reading time
+  - Principal Author(s)
+  - Year created (last update or maintenance status)
+  
 ## Tutorials
 
 ### Nix
-- https://nixos.org/guides/nix-pills/enter-environment.html
+
+- [Nix Pills Chapter 3: Enter the Environment](https://nixos.org/guides/nix-pills/enter-environment.html)
+  
+  Installation with `nix-env`, rollback and switching generations, showing references and closures.
+  
+  - Reading time: 7 min
+  - Author: Luca Bruno
+  - Created: 2015 (effectively unmaintained since 2017)
+
 - https://nixos.org/guides/nix-pills/our-first-derivation.html
 - https://nixos.org/guides/nix-pills/working-derivation.html
 - https://nixos.org/guides/nix-pills/garbage-collector.html
@@ -103,4 +118,4 @@
 - https://nixos.org/manual/nixpkgs/stable
 
 ### NixOS
-- https://nixos.org/manual/nixos/stable
\ No newline at end of file
+- https://nixos.org/manual/nixos/stable