diff --git a/rvfi/insns/README.md b/rvfi/insns/README.md
index a959fff..596e5a4 100644
--- a/rvfi/insns/README.md
+++ b/rvfi/insns/README.md
@@ -97,6 +97,7 @@ Below is a list of instructions currently supported by this port of the riscv-fo
     - `InsnRV64IITypeLoad`: RV64I I-Type Instruction (Load Variation)
       - `InsnLwu`: LWU instruction
       - `InsnLd`: LD instruction
+    - `InsnAddiw`: ADDIW instruction
   - `InsnSd`: SD instruction
 
 ### ISAs