diff --git a/mrbgems/mruby-catch/src/catch.c b/mrbgems/mruby-catch/src/catch.c
index 048a44738..240ec690c 100644
--- a/mrbgems/mruby-catch/src/catch.c
+++ b/mrbgems/mruby-catch/src/catch.c
@@ -6,14 +6,14 @@
 #include <mruby/opcode.h>
 #include <mruby/presym.h>
 
-
 MRB_PRESYM_DEFINE_VAR_AND_INITER(catch_syms_3, 1, MRB_SYM(call))
 static const mrb_code catch_iseq_3[18] = {
-  OP_ENTER,    0x00, 0x00, 0x00,
-  OP_GETUPVAR, 0x02, 0x02, 0x01,
-  OP_GETUPVAR, 0x03, 0x01, 0x01,
-  OP_SEND,     0x02, 0x00, 0x01,
-  OP_RETURN,   0x02,};
+  OP_ENTER,    0x00, 0x00, 0x00,     /* 000 ENTER         0:0:0:0:0:0:0 (0x0) */
+  OP_GETUPVAR, 0x02, 0x02, 0x01,     /* 004 GETUPVAR      R2      2       1   */
+  OP_GETUPVAR, 0x03, 0x01, 0x01,     /* 008 GETUPVAR      R3      1       1   */
+  OP_SEND,     0x02, 0x00, 0x01,     /* 012 SEND          R2      :call   n=1 */
+  OP_RETURN,   0x02,                 /* 016 RETURN        R2                  */
+};
 static const mrb_irep catch_irep_3 = {
   2,5,0,
   MRB_IREP_STATIC,catch_iseq_3,
@@ -26,10 +26,11 @@ static const mrb_irep *catch_reps_2[1] = {
   &catch_irep_3,
 };
 static const mrb_code catch_iseq_2[13] = {
-  OP_ENTER,    0x00, 0x00, 0x00,
-  OP_LAMBDA,   0x02, 0x00,
-  OP_SEND,     0x02, 0x00, 0x00,
-  OP_RETURN,   0x02,};
+  OP_ENTER,    0x00, 0x00, 0x00,     /* 000 ENTER         0:0:0:0:0:0:0 (0x0)         */
+  OP_LAMBDA,   0x02, 0x00,           /* 004 LAMBDA        R2      I(0:0x555556198140) */
+  OP_SEND,     0x02, 0x00, 0x00,     /* 007 SEND          R2      :call   n=0         */
+  OP_RETURN,   0x02,                 /* 011 RETURN        R2                          */
+};
 static const mrb_irep catch_irep_2 = {
   2,4,0,
   MRB_IREP_STATIC,catch_iseq_2,
@@ -43,15 +44,16 @@ static const mrb_irep *catch_reps_1[1] = {
 };
 MRB_PRESYM_DEFINE_VAR_AND_INITER(catch_syms_1, 3, MRB_SYM(Object), MRB_SYM(new), MRB_SYM(call))
 static const mrb_code catch_iseq_1[29] = {
-  OP_ENTER,    0x00, 0x20, 0x01,
-  OP_JMP,      0x00, 0x03,
-  OP_JMP,      0x00, 0x0a,
-  OP_GETCONST, 0x03, 0x00,
-  OP_SEND,     0x03, 0x01, 0x00,
-  OP_MOVE,     0x01, 0x03,
-  OP_LAMBDA,   0x03, 0x00,
-  OP_SEND,     0x03, 0x02, 0x00,
-  OP_RETURN,   0x03,};
+  OP_ENTER,    0x00, 0x20, 0x01,    /* 000 ENTER         0:1:0:0:0:0:1 (0x2001)      */
+  OP_JMP,      0x00, 0x03,          /* 004 JMP           010                         */
+  OP_JMP,      0x00, 0x0a,          /* 007 JMP           020                         */
+  OP_GETCONST, 0x03, 0x00,          /* 010 GETCONST      R3      Object              */
+  OP_SEND,     0x03, 0x01, 0x00,    /* 013 SEND          R3      :new    n=0         */
+  OP_MOVE,     0x01, 0x03,          /* 017 MOVE          R1      R3                  */
+  OP_LAMBDA,   0x03, 0x00,          /* 020 LAMBDA        R3      I(0:0x5555561980c0) */
+  OP_SEND,     0x03, 0x02, 0x00,    /* 023 SEND          R3      :call   n=0         */
+  OP_RETURN,   0x03,                /* 027 RETURN        R3                          */
+};
 static const mrb_irep catch_irep = {
   3,5,0,
   MRB_IREP_STATIC,catch_iseq_1,
@@ -60,7 +62,6 @@ static const mrb_irep catch_irep = {
   NULL,
   29,0,3,1,0
 };
-
 static const struct RProc catch_proc = {
   NULL, NULL, MRB_TT_PROC, MRB_GC_RED, MRB_FL_OBJ_IS_FROZEN | MRB_PROC_SCOPE | MRB_PROC_STRICT,
   { &catch_irep }, NULL, { NULL }