diff --git a/isa/isa.yaml b/isa/isa.yaml
index d187418c9bb32acefa520262e00bb4808a3e409b..04aa806e8fc3c29f74d99b2c9562f9a11fdf7b28 100644
--- a/isa/isa.yaml
+++ b/isa/isa.yaml
@@ -249,7 +249,7 @@ verification:
 isa_information:
     - description: The last encoding number of various ISA. It should be maintained as long as ISA changes.
       last_opcode_idx: 0xd5
-      last_throw_prefixed_opcode_idx: 0x08
+      last_throw_prefixed_opcode_idx: 0x09
       last_wide_prefixed_opcode_idx: 0x13
       last_deprecated_prefixed_opcode_idx: 0x2f
 
@@ -786,6 +786,12 @@ groups:
         opcode_idx: [0x07, 0x08]
         format: [pref_op_imm_8, pref_op_imm_16]
         prefix: throw
+      - sig: throw.undefinedifholewithname string_id
+        acc: in:top
+        opcode_idx: [0x09]
+        format: [pref_op_id_16]
+        prefix: throw
+        properties: [string_id]
 
   - title: call instructions
     description: call