From 3f4bb0af3fa5d664641a19910b5ecd684072818e Mon Sep 17 00:00:00 2001
From: Anthony Shaw <anthony.p.shaw@gmail.com>
Date: Mon, 9 Jan 2023 08:14:06 +1100
Subject: [PATCH] Annotate only_one comment with additional context

See #1490
---
 src/textual/css/query.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/textual/css/query.py b/src/textual/css/query.py
index c14d032abc..fe9366d50b 100644
--- a/src/textual/css/query.py
+++ b/src/textual/css/query.py
@@ -246,7 +246,7 @@ def only_one(
             # should *not* be anything there, so we *should* get an
             # IndexError. We *could* have just checked the length of the
             # query, but the idea here is to do the check as cheaply as
-            # possible.
+            # possible. "There can be only one!" -- Duncan McLeod
             _ = self.nodes[1]
             raise TooManyMatches(
                 "Call to only_one resulted in more than one matched node"