diff --git a/SPEC.md b/SPEC.md
index 20378bd..e8dba5e 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -61,7 +61,7 @@ type Bytecode = {
 
 type Instruction = {
   op: OpCode
-  operand?: number | string | { positional: number; named: number }
+  operand?: number | string
 }
 
 type Constant =
@@ -526,7 +526,9 @@ LOAD 'mkdir'
 PUSH 'src/bin'        # positional arg
 PUSH 'recursive'      # name
 PUSH true             # value
-CALL { positional: 1, named: 1 }
+PUSH 1                # positionalCount
+PUSH 1                # namedCount
+CALL
 ```
 
 ### Tail Recursive Function
@@ -549,12 +551,16 @@ recurse:
   LOAD 'n'
   LOAD 'acc'
   MUL
-  TAIL_CALL 2        # No stack growth!
+  PUSH 2             # positionalCount
+  PUSH 0             # namedCount
+  TAIL_CALL          # No stack growth!
 main:
   LOAD 'factorial'
   PUSH 5
   PUSH 1
-  CALL 2
+  PUSH 2             # positionalCount
+  PUSH 0             # namedCount
+  CALL
 ```
 
 ## Error Conditions