From 7e62b9e048875129f86357209d267e88c3c3b79b Mon Sep 17 00:00:00 2001
From: Silas Dilkes <36165522+sjdilkes@users.noreply.github.com>
Date: Thu, 21 Nov 2024 10:55:25 +0000
Subject: [PATCH] Update index.md

---
 docs/index.md | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/docs/index.md b/docs/index.md
index 1061dd1e..96a89823 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -85,7 +85,8 @@ tags: [skip-execution]
 compiled_circ = backend.get_compiled_circuit(circ)
 ```
 
-The passes applied by different levels of optimisation are specified in the table below.
+The passes applied by different levels of optimisation are specified in the table below. Note that optimisation level 0, 1 and 2 do not remove barriers from 
+a circuit, while optimisation level 3 will.
 
 :::{list-table} **Default compilation pass for the QuantinuumBackend**
 :widths: 25 25 25