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diff --git a/src/typo.h b/src/typo.h
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+// Copyright © Tavian Barnes <tavianator@tavianator.com>
+// SPDX-License-Identifier: 0BSD
+
+#ifndef BFS_TYPO_H
+#define BFS_TYPO_H
+
+/**
+ * Find the "typo" distance between two strings.
+ *
+ * @param actual
+ *         The actual string typed by the user.
+ * @param expected
+ *         The expected valid string.
+ * @return The distance between the two strings.
+ */
+int typo_distance(const char *actual, const char *expected);
+
+#endif // BFS_TYPO_H