diff --git a/nixos/modules/services/security/haveged.nix b/nixos/modules/services/security/haveged.nix
index 1d52ed55dbda..2aa523bf70a4 100644
--- a/nixos/modules/services/security/haveged.nix
+++ b/nixos/modules/services/security/haveged.nix
@@ -46,7 +46,7 @@ in
   
     systemd.services.haveged =
       { description = "Entropy Harvesting Daemon";
-        unitConfig.documentation = "man:haveged(8)";
+        unitConfig.Documentation = "man:haveged(8)";
         wantedBy = [ "multi-user.target" ];
         
         path = [ pkgs.haveged ];
@@ -60,4 +60,4 @@ in
 
   };
   
-}
\ No newline at end of file
+}