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diff --git a/src/crypto/CryptonightR_JIT.h b/src/crypto/CryptonightR_JIT.h
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index 000000000..5f689b37b
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+++ b/src/crypto/CryptonightR_JIT.h
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+#ifndef CRYPTONIGHTR_JIT_H
+#define CRYPTONIGHTR_JIT_H
+
+// Minimalistic JIT code generator for random math sequence in CryptonightR
+//
+// Usage:
+// - Allocate writable and executable memory
+// - Call v4_generate_JIT_code with "buf" pointed to memory allocated on previous step
+// - Call the generated code instead of "v4_random_math(code, r)", omit the "code" parameter
+
+typedef void (*v4_random_math_JIT_func)(uint32_t* r) __attribute__((sysv_abi));
+
+// Given the random math sequence, generates machine code (x86-64) for it
+// Returns 0 if code was generated successfully
+// Returns -1 if provided buffer was too small
+int v4_generate_JIT_code(const struct V4_Instruction* code, v4_random_math_JIT_func buf, const size_t buf_size);
+
+#endif // CRYPTONIGHTR_JIT_H