diff --git a/common/nix.nix b/common/nix.nix
index cd34c57..c60a2b9 100644
--- a/common/nix.nix
+++ b/common/nix.nix
@@ -20,6 +20,6 @@
     options = "--delete-older-than 10d";
   };
 
-  # Allow running dynamically linked binaries.
-  programs.nix-ld.enable = true;
+  programs.nix-ld.enable = true; # Allow running dynamically linked binaries.
+  programs.direnv.enable = true; # Automatically add nix devshells.
 }