diff --git a/modules/global/shell.nix b/modules/global/shell.nix
index 40ed103..abcfc46 100644
--- a/modules/global/shell.nix
+++ b/modules/global/shell.nix
@@ -29,6 +29,9 @@ in
     llg = "ll --git-ignore";
     llgt = "llt --git-ignore";
 
+    # erdtree
+    et = "erd";
+
     # git
     g = "git";