diff --git a/source/reference/glossary.md b/source/reference/glossary.md
index d66e524..5724ffc 100644
--- a/source/reference/glossary.md
+++ b/source/reference/glossary.md
@@ -7,7 +7,7 @@ Nix
     Read /nɪks/ ("Niks").
 
     :::{seealso}
-    - [Nix Reference Manual](./nix-manual.md)
+    - [Nix reference manual](./nix-manual.md)
     - [Nix source code](https://github.com/NixOS/nix)
     :::
 
@@ -31,7 +31,7 @@ Nixpkgs
     Read /nɪks ˈpækɪʤɪz/ ("Nix packages").
 
     :::{seealso}
-    - [Nixpkgs Reference Manual](https://nixos.org/manual/nixpkgs)
+    - [Nixpkgs reference manual](https://nixos.org/manual/nixpkgs)
     - [Nixpkgs source code](https://github.com/NixOS/nixpkgs)
     :::
 
@@ -41,7 +41,7 @@ NixOS
     Read /nɪks oʊ ɛs/ ("Niks Oh Es").
 
     :::{seealso}
-    - [NixOS Reference Manual](https://nixos.org/manual/nixos)
+    - [NixOS reference manual](https://nixos.org/manual/nixos)
     - [NixOS source code](https://github.com/NixOS/nixpkgs/tree/master/nixos)
     :::
 ```
diff --git a/source/reference/index.md b/source/reference/index.md
index f42e487..2329ac3 100644
--- a/source/reference/index.md
+++ b/source/reference/index.md
@@ -8,8 +8,8 @@ These sections contains collections of detailed technical descriptions.
 :maxdepth: 2
 
 ./nix-manual.md
-Nixpkgs Manual <https://nixos.org/manual/nixpkgs/stable/>
-NixOS Manual <https://nixos.org/manual/nixos/stable/>
+Nixpkgs manual <https://nixos.org/manual/nixpkgs/stable/>
+NixOS manual <https://nixos.org/manual/nixos/stable/>
 Recommended support tools <https://github.com/nix-community/awesome-nix>
 ../recommended-reading.md
 pinning-nixpkgs.md