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diff --git a/libalee/corewords.hpp b/libalee/corewords.hpp
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+++ b/libalee/corewords.hpp
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+/**
+ * Alee Forth: A portable and concise Forth implementation in modern C++.
+ * Copyright (C) 2023  Clyne Sullivan <clyne@bitgloo.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#ifndef ALEEFORTH_COREWORDS_HPP
+#define ALEEFORTH_COREWORDS_HPP
+
+#include "types.hpp"
+#include "state.hpp"
+
+void user_sys(State&);
+
+class CoreWords
+{
+public:
+    constexpr static std::size_t WordCount = 32;
+
+    constexpr static Cell Immediate = (1 << 5);
+
+    constexpr static int Semicolon = 26;
+
+    static int findi(const char *);
+    static int findi(State&, Word);
+    static void run(unsigned int, State&);
+
+private:
+    constexpr static char wordsarr[] =
+        "_lit\0drop\0dup\0swap\0pick\0sys\0"
+        "+\0-\0m*\0_/\0_%\0"
+        "_@\0_!\0>r\0r>\0=\0"
+        "<\0&\0|\0^\0"
+        "<<\0>>\0:\0_'\0execute\0"
+        "exit\0;\0_jmp0\0_jmp\0"
+        "depth\0_rdepth\0_in\0";
+};
+
+#endif // ALEEFORTH_COREWORDS_HPP
+