diff --git a/src/main/scala/com/github/unchama/seichiassist/util/BreakUtil.scala b/src/main/scala/com/github/unchama/seichiassist/util/BreakUtil.scala
index 867e544e25..e8b041f2a1 100644
--- a/src/main/scala/com/github/unchama/seichiassist/util/BreakUtil.scala
+++ b/src/main/scala/com/github/unchama/seichiassist/util/BreakUtil.scala
@@ -155,7 +155,6 @@ object BreakUtil {
     val materialType = targetBlock.getType
     val isNotQuartzBlockAndQuartzStairs =
       materialType != Material.QUARTZ_BLOCK && materialType != Material.QUARTZ_STAIRS
-    // NOTE: targetBlock#getDataが7は下つきハーフブロック、15は上つきハーフブロック
     val isNotQuartzSlab =
       materialType != Material.QUARTZ_SLAB
     val isNotMadeFromQuartz = isNotQuartzBlockAndQuartzStairs && isNotQuartzSlab