diff --git a/src/agh/cli.py b/src/agh/cli.py
index e3b7204..4925cd1 100644
--- a/src/agh/cli.py
+++ b/src/agh/cli.py
@@ -192,14 +192,165 @@ def submissionCompleter(*args, **kwargs):
 assign_add_required_parser = assignment_subparsers.add_parser("add-required", help="Add required files")
 assign_add_required_parser.add_argument("files", nargs="+", help="Required file names", type=Path)
 assign_add_required_parser.add_argument("type", help="Type of the required file", type=str).completer = lambda **kwargs: [
-    "txt",
-    "py",
+    "abc",
+    "actionscript",
+    "ada",
+    "agda",
+    "apache",
+    "asn1",
+    "asp",
+    "ats",
+    "awk",
+    "bash",
+    "bibtex",
+    "boo",
     "c",
+    "changelog",
+    "clojure",
+    "cmake",
+    "coffee",
+    "coldfusion",
+    "comments",
+    "commonlisp",
     "cpp",
-    "java",
+    "crystal",
+    "cs",
+    "css",
+    "curry",
+    "d",
+    "dart",
+    "debiancontrol",
     "default",
-    "make",
-]
+    "diff",
+    "djangotemplate",
+    "dockerfile",
+    "dosbat",
+    "dot",
+    "doxygen",
+    "doxygenlua",
+    "dtd",
+    "eiffel",
+    "elixir",
+    "elm",
+    "email",
+    "erlang",
+    "fasm",
+    "fortranfixed",
+    "fortranfree",
+    "fsharp",
+    "gap",
+    "gcc",
+    "glsl",
+    "gnuassembler",
+    "go",
+    "gpr",
+    "graphql",
+    "groovy",
+    "hamlet",
+    "haskell",
+    "haxe",
+    "html",
+    "idris",
+    "ini",
+    "isocpp",
+    "j",
+    "java",
+    "javadoc",
+    "javascript",
+    "javascriptreact",
+    "json",
+    "jsp",
+    "julia",
+    "kotlin",
+    "latex",
+    "lex",
+    "lilypond",
+    "literatecurry",
+    "literatehaskell",
+    "llvm",
+    "lua",
+    "m4",
+    "makefile",
+    "mandoc",
+    "markdown",
+    "mathematica",
+    "matlab",
+    "maxima",
+    "mediawiki",
+    "metafont",
+    "mips",
+    "modelines",
+    "modula2",
+    "modula3",
+    "monobasic",
+    "mustache",
+    "nasm",
+    "nim",
+    "nix",
+    "noweb",
+    "objectivec",
+    "objectivecpp",
+    "ocaml",
+    "octave",
+    "opencl",
+    "orgmode",
+    "pascal",
+    "perl",
+    "php",
+    "pike",
+    "postscript",
+    "povray",
+    "powershell",
+    "prolog",
+    "protobuf",
+    "pure",
+    "purebasic",
+    "purescript",
+    "python",
+    "qml",
+    "r",
+    "racket",
+    "raku",
+    "relaxng",
+    "relaxngcompact",
+    "rest",
+    "rhtml",
+    "roff",
+    "ruby",
+    "rust",
+    "sass",
+    "scala",
+    "scheme",
+    "sci",
+    "scss",
+    "sed",
+    "sgml",
+    "sml",
+    "spdxcomments",
+    "sql",
+    "sqlmysql",
+    "sqlpostgresql",
+    "stan",
+    "stata",
+    "swift",
+    "systemverilog",
+    "tcl",
+    "tcsh",
+    "terraform",
+    "texinfo",
+    "toml",
+    "typescript",
+    "verilog",
+    "vhdl",
+    "xml",
+    "xorg",
+    "xslt",
+    "xul",
+    "yacc",
+    "yaml",
+    "zig",
+    "zsh",
+] # This is from `quarto pandoc --list-highlight-languages`
 assign_add_required_parser.add_argument("-d", "--description", help="Description of the required files", type=str, default="")
 assign_add_required_parser.add_argument("-t", "--title", help="Title of the required files", type=str, default="")
 assign_add_required_parser.add_argument(