From e4de1c55044a31fd357b48e61e051d5e82a723af Mon Sep 17 00:00:00 2001
From: Daisuke Maki <lestrrat+github@gmail.com>
Date: Tue, 17 Feb 2026 11:58:53 +0900
Subject: [PATCH] doc tweak

---
 interface.go | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/interface.go b/interface.go
index e140533..391ce9a 100644
--- a/interface.go
+++ b/interface.go
@@ -483,7 +483,10 @@ type RangeStart struct {
 }
 
 // Buffer interface is used for containers for lines to be
-// processed by peco.
+// processed by peco. The unexported linesInRange method seals this
+// interface to the peco package — external packages cannot implement it.
+// This is intentional: linesInRange is an internal optimization for
+// efficient pagination in NewFilteredBuffer, not part of the public contract.
 type Buffer interface {
 	linesInRange(int, int) []line.Line
 	LineAt(int) (line.Line, error)