diff --git a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/ChatModel.kt b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/ChatModel.kt
index bc9d1cf91a..c36f5338dd 100644
--- a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/ChatModel.kt
+++ b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/model/ChatModel.kt
@@ -66,6 +66,7 @@ object ChatModel {
   // current chat
   val chatId = mutableStateOf<String?>(null)
   val chatItems = mutableStateOf(SnapshotStateList<ChatItem>())
+  // chatItemId, SectionArea
   val chatItemsSectionArea = mutableMapOf<Long, ChatSectionArea>()
   // rhId, chatId
   val deletedChats = mutableStateOf<List<Pair<Long?, String>>>(emptyList())
diff --git a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatSections.kt b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatSections.kt
index 4bed8da7a3..520173f8fc 100644
--- a/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatSections.kt
+++ b/apps/multiplatform/common/src/commonMain/kotlin/chat/simplex/common/views/chat/ChatSections.kt
@@ -25,6 +25,7 @@ data class ChatSectionAreaBoundary (
 data class ChatSection (
   val items: MutableList<SectionItems>,
   val boundary: ChatSectionAreaBoundary,
+  // chatItemId, index in rendered LazyColumn
   val itemPositions: MutableMap<Long, Int>
 )