diff --git a/LEGO1/lego/legoomni/include/historybook.h b/LEGO1/lego/legoomni/include/historybook.h
index 3f139ded..3bdc4acf 100644
--- a/LEGO1/lego/legoomni/include/historybook.h
+++ b/LEGO1/lego/legoomni/include/historybook.h
@@ -36,9 +36,9 @@ class HistoryBook : public LegoWorld {
 
 private:
 	LegoGameState::Area m_transitionDestination; // 0xf8
-	undefined m_bigData1[104];                   // 0xfc
-	undefined m_bigData2[560];                   // 0x164
-	undefined m_bigData3[80];                    // 0x394
+	undefined m_unk0xfc[104];                    // 0xfc
+	undefined m_unk0x164[560];                   // 0x164
+	undefined m_unk0x394[80];                    // 0x394
 };
 
 #endif // HISTORYBOOK_H
diff --git a/LEGO1/lego/legoomni/src/isle/historybook.cpp b/LEGO1/lego/legoomni/src/isle/historybook.cpp
index b5fcd4c2..3699c2a2 100644
--- a/LEGO1/lego/legoomni/src/isle/historybook.cpp
+++ b/LEGO1/lego/legoomni/src/isle/historybook.cpp
@@ -12,9 +12,9 @@ DECOMP_SIZE_ASSERT(HistoryBook, 0x3e4)
 // FUNCTION: LEGO1 0x100822f0
 HistoryBook::HistoryBook()
 {
-	memset(m_bigData1, NULL, sizeof(m_bigData1));
-	memset(m_bigData2, NULL, sizeof(m_bigData2));
-	memset(m_bigData3, NULL, sizeof(m_bigData3));
+	memset(m_unk0xfc, NULL, sizeof(m_unk0xfc));
+	memset(m_unk0x164, NULL, sizeof(m_unk0x164));
+	memset(m_unk0x394, NULL, sizeof(m_unk0x394));
 	NotificationManager()->Register(this);
 }