diff --git a/hall.scm b/hall.scm
index de7eef2..7cb1c33 100644
--- a/hall.scm
+++ b/hall.scm
@@ -10,23 +10,24 @@
  (home-page "")
  (license gpl3+)
  (dependencies `(("guile-config" ,guile-config)
-				 ("guile-ncurses" ,guile-ncurses)
-				 ("guile-ts" ,guile-ts)))
+                 ("guile-ncurses" ,guile-ncurses)
+                 ("guile-ts" ,guile-ts)
+                 ("tree-sitter-scheme" ,tree-sitter-scheme)))
  (skip ())
  (files (libraries
          ((directory "sloth" ((scheme-file "editor")
-							  (scheme-file "interface")))))
+                              (scheme-file "interface")))))
         (tests ((directory "tests" ())))
         (programs
-		 ((directory "scripts" ((in-file "sloth")))))
+                 ((directory "scripts" ((in-file "sloth")))))
         (documentation
          ((directory "doc" ((texi-file "sloth")))
           (text-file "LICENSE")
-		  (symlink "README" "README.org")
+                  (symlink "README" "README.org")
           (org-file "README")))
         (infrastructure
          ((text-file ".gitignore")
-		  (text-file "zhu-li")
-	      (scheme-file "guix")
-		  (scheme-file "hall")
-		  (scheme-file "manifest")))))
+                  (text-file "zhu-li")
+              (scheme-file "guix")
+                  (scheme-file "hall")
+                  (scheme-file "manifest")))))