1 files changed, 1 insertions, 0 deletions
diff --git a/shell.nix b/shell.nix
index b2e9e65..2116197 100644
--- a/shell.nix
+++ b/shell.nix
@@ -52,6 +52,7 @@ let
             pkgs.jing
             pkgs.libxml2
             pkgs.libxslt
+            pkgs.unixtools.column
             pkgs.validator-nu
             pkgs.yj
           ]}