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diff --git a/src/help.cc b/src/help.cc
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+// This file is part of Cait <https://github.com/Fuwn/cait>.
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, version 3.
+//
+// This program is distributed in the hope that it will be useful, but
+// WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <http://www.gnu.org/licenses/>.
+//
+// Copyright (C) 2022-2022 Fuwn <[email protected]>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#include <thread>
+
+#include "help.hh"
+
+namespace cait {
+
+auto help_message() -> std::string {
+  std::ostringstream help;
+
+  help
+      << "usage: cait [options] [targets...]\n"
+         "\n"
+         "if targets are unspecified, builds the 'default' target (see "
+         "manual).\n"
+         "\n"
+         "options:\n"
+         "  --version      print cait version (\"" VERSION "\")\n"
+         "  -v, --verbose  show all command lines while building\n"
+         "\n"
+         "  -C DIR   change to DIR before doing anything else\n"
+         "  -f FILE  specify input build file [default=build.cait]\n"
+         "\n"
+         "  -j N     run N jobs in parallel (0 means infinity) [default="
+      << std::thread::hardware_concurrency() + 2
+      << " on this system]\n"
+         "  -k N     keep going until N jobs fail (0 means infinity) "
+         "[default=1]\n"
+         "  -l N     do not start new jobs if the load average is greater "
+         "than N\n"
+         "  -n       dry run (don't run commands but act like they succeeded)\n"
+         "\n"
+         "  -d MODE  enable debugging (use '-d list' to list modes)\n"
+         "  -t TOOL  run a subtool (use '-t list' to list subtools)\n"
+         "    terminates toplevel options; further flags are passed to the "
+         "tool\n"
+         "  -w FLAG  adjust warnings (use '-w list' to list warnings)";
+
+  return help.str();
+}
+
+} // namespace cait