diff --git a/doc/internal/opcode.md b/doc/internal/opcode.md
index d93d018d4..e8b642e28 100644
--- a/doc/internal/opcode.md
+++ b/doc/internal/opcode.md
@@ -73,7 +73,7 @@ sign) of operands.
 | `OP_SSENDB`        | `BBB`          | `R(a) = self.send(Syms(b),R(a+1)..,R(a+n+1):R(a+n+2)..,&R(a+n+2k+1))` |
 | `OP_SEND`          | `BBB`          | `R(a) = R(a).send(Syms(b),R(a+1)..,R(a+n+1):R(a+n+2)..) (c=n|k<<4)` |
 | `OP_SENDB`         | `BBB`          | `R(a) = R(a).send(Syms(b),R(a+1)..,R(a+n+1):R(a+n+2)..,&R(a+n+2k+1))` |
-| `OP_CALL`          | `-`            | `R(0) = self.call(frame.argc, frame.argv)`                 |
+| `OP_CALL`          | `-`            | `self.call(*, **, &) (But overlay the current call frame; tailcall)` |
 | `OP_SUPER`         | `BB`           | `R(a) = super(R(a+1),... ,R(a+b+1))`                       |
 | `OP_ARGARY`        | `BS`           | `R(a) = argument array (16=m5:r1:m5:d1:lv4)`               |
 | `OP_ENTER`         | `W`            | `arg setup according to flags (23=m5:o5:r1:m5:k5:d1:b1)`   |
diff --git a/include/mruby/ops.h b/include/mruby/ops.h
index b4d71748b..cda796f08 100644
--- a/include/mruby/ops.h
+++ b/include/mruby/ops.h
@@ -61,7 +61,7 @@ OPCODE(SSEND,      BBB)      /* R[a] = self.send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n
 OPCODE(SSENDB,     BBB)      /* R[a] = self.send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..,&R[a+n+2k+1]) */
 OPCODE(SEND,       BBB)      /* R[a] = R[a].send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..) (c=n|k<<4) */
 OPCODE(SENDB,      BBB)      /* R[a] = R[a].send(Syms[b],R[a+1]..,R[a+n+1]:R[a+n+2]..,&R[a+n+2k+1]) */
-OPCODE(CALL,       Z)        /* R[0] = self.call(frame.argc, frame.argv) */
+OPCODE(CALL,       Z)        /* self.call(*, **, &) (But overlay the current call frame; tailcall) */
 OPCODE(SUPER,      BB)       /* R[a] = super(R[a+1],... ,R[a+b+1]) */
 OPCODE(ARGARY,     BS)       /* R[a] = argument array (16=m5:r1:m5:d1:lv4) */
 OPCODE(ENTER,      W)        /* arg setup according to flags (23=m5:o5:r1:m5:k5:d1:b1) */