diff --git a/virtual_machine/disasm.h b/virtual_machine/disasm.h
new file mode 100644
index 000000000..f963bee18
--- /dev/null
+++ b/virtual_machine/disasm.h
@@ -0,0 +1,16 @@
+#ifndef DISASM_H
+#define DISASM_H
+
+#include "bytecode.h"
+#include <stdio.h>
+
+/* Disassemble all public symbols in bc, writing output to f.
+   Returns 0 on success, -1 on error. */
+int disasm(const bytecode *bc, FILE *f);
+
+/* Disassemble a single function starting at code_offset within bc->code,
+   writing output to f. name may be NULL. */
+int disasm_func(const bytecode *bc, size_t code_offset, const char *name,
+                uint8_t flag, FILE *f);
+
+#endif /* DISASM_H */