diff --git a/README.md b/README.md
index 0aa636a..b32164f 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@
 Detect CPU ISA features with single-file
 
 <table>
-<tr><td>CPU</td><td>&#9989; x86, x86-64<br/>&#9989; arm, aarch64</td><td rowspan=3>
+<tr><td>CPU</td><td>&#9989; x86, x86-64<br/>&#9989; arm, aarch64<br/>&#9989; risc-v</td><td rowspan=3>
   
 ```c
 #define RUAPU_IMPLEMENTATION
@@ -223,7 +223,7 @@ _`fma4` on zen1, ISA in hypervisor, etc._
 |mips||
 |powerpc||
 |loongarch||
-|risc-v||
+|risc-v|`i` `m` `a` `f` `d` `c`|
 
 ## Techniques inside ruapu
 ruapu is implemented in C language to ensure the widest possible portability.
diff --git a/main.c b/main.c
index ba49dd1..dca6518 100644
--- a/main.c
+++ b/main.c
@@ -65,6 +65,14 @@ int main()
     PRINT_ISA_SUPPORT(neon)
     PRINT_ISA_SUPPORT(vfpv4)
 
+#elif __riscv
+    PRINT_ISA_SUPPORT(i)
+    PRINT_ISA_SUPPORT(m)
+    PRINT_ISA_SUPPORT(a)
+    PRINT_ISA_SUPPORT(f)
+    PRINT_ISA_SUPPORT(d)
+    PRINT_ISA_SUPPORT(c)
+
 #endif
 
     return 0;
diff --git a/ruapu.h b/ruapu.h
index ff3c19e..b8b9711 100644
--- a/ruapu.h
+++ b/ruapu.h
@@ -130,11 +130,9 @@ static int ruapu_detect_isa(ruapu_some_inst some_inst)
     return g_ruapu_sigill_caught ? 0 : 1;
 }
 
-#if defined(__i386__) || defined(__x86_64__) || defined(_M_IX86) || defined(_M_X64)
+#if defined(__i386__) || defined(__x86_64__)
 #define RUAPU_INSTCODE(isa, ...) static void ruapu_some_##isa() { asm volatile(".byte " #__VA_ARGS__ : : : ); }
-#elif __aarch64__
-#define RUAPU_INSTCODE(isa, ...) static void ruapu_some_##isa() { asm volatile(".word " #__VA_ARGS__ : : : ); }
-#elif __arm__
+#elif __aarch64__ || __arm__ || __riscv
 #define RUAPU_INSTCODE(isa, ...) static void ruapu_some_##isa() { asm volatile(".word " #__VA_ARGS__ : : : ); }
 #endif
 
@@ -213,6 +211,14 @@ RUAPU_INSTCODE(neon, 0xf2000d40) // vadd.f32 q0,q0,q0
 RUAPU_INSTCODE(vfpv4, 0xf3b60600) // vcvt.f16.f32 d0,q0
 #endif
 
+#elif __riscv
+RUAPU_INSTCODE(i, 0x00a50533) // add a0,a0,a0
+RUAPU_INSTCODE(m, 0x02a50533) // mul a0,a0,a0
+RUAPU_INSTCODE(a, 0x100122af, 0x185122af) // lr.w t0,(sp) + sc.w t0,t0,(sp)
+RUAPU_INSTCODE(f, 0x10a57553) // fmul.s fa0,fa0,fa0
+RUAPU_INSTCODE(d, 0x12a57553) // fmul.d fa0,fa0,fa0
+RUAPU_INSTCODE(c, 0x0001952a) // add a0,a0,a0 + nop
+
 #endif
 
 #undef RUAPU_INSTCODE
@@ -271,6 +277,14 @@ RUAPU_ISAENTRY(edsp)
 RUAPU_ISAENTRY(neon)
 RUAPU_ISAENTRY(vfpv4)
 
+#elif __riscv
+RUAPU_ISAENTRY(i)
+RUAPU_ISAENTRY(m)
+RUAPU_ISAENTRY(a)
+RUAPU_ISAENTRY(f)
+RUAPU_ISAENTRY(d)
+RUAPU_ISAENTRY(c)
+
 #endif
 };