diff --git a/components/ulp/include/esp32/ulp.h b/components/ulp/include/esp32/ulp.h
index 2f22937e28..309f09b8d6 100644
--- a/components/ulp/include/esp32/ulp.h
+++ b/components/ulp/include/esp32/ulp.h
@@ -232,7 +232,7 @@ union ulp_insn {
         uint32_t unused : 8;        /*!< Unused */
         uint32_t low : 5;           /*!< Low bit */
         uint32_t high : 5;          /*!< High bit */
-        uint32_t opcode : 4;        /*!< Opcode (OPCODE_WR_REG) */
+        uint32_t opcode : 4;        /*!< Opcode (OPCODE_RD_REG) */
     } rd_reg;                       /*!< Format of RD_REG instruction */
 
     struct {
diff --git a/components/ulp/include/esp32s2/ulp.h b/components/ulp/include/esp32s2/ulp.h
index 58331cf52c..07ae895e99 100644
--- a/components/ulp/include/esp32s2/ulp.h
+++ b/components/ulp/include/esp32s2/ulp.h
@@ -201,7 +201,7 @@ union ulp_insn {
         uint32_t unused : 8;        /*!< Unused */
         uint32_t low : 5;           /*!< Low bit */
         uint32_t high : 5;          /*!< High bit */
-        uint32_t opcode : 4;        /*!< Opcode (OPCODE_WR_REG) */
+        uint32_t opcode : 4;        /*!< Opcode (OPCODE_RD_REG) */
     } rd_reg;                       /*!< Format of RD_REG instruction */
 
     struct {