Merge pull request bitcoinbook#497 from theStack/twofewerops

script opcode count IF vs. VERIFY: diff is two ops
shivaprabhu · Feb 14, 2018 · 678f2f3 · 678f2f3
2 parents bf4e865 + cf87bad
commit 678f2f3
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/ch07.asciidoc b/ch07.asciidoc
@@ -498,7 +498,7 @@ Bob's unlocking script is identical:
 <Bob's Sig> <hash pre-image>
 ----
 
-The script with +IF+ does the same thing as using an opcode with a +VERIFY+ suffix; they both operate as guard clauses. However, the +VERIFY+ construction is more efficient, using one fewer opcode.
+The script with +IF+ does the same thing as using an opcode with a +VERIFY+ suffix; they both operate as guard clauses. However, the +VERIFY+ construction is more efficient, using two fewer opcodes.
 
 So, when do we use +VERIFY+ and when do we use +IF+? If all we are trying to do is to attach a precondition (guard clause), then +VERIFY+ is better. If, however, we want to have more than one execution path (flow control), then we need an +IF...ELSE+ flow control clause.