diff --git a/MissionEditor/IniFile.h b/MissionEditor/IniFile.h
index f2c7057..5b74d5d 100644
--- a/MissionEditor/IniFile.h
+++ b/MissionEditor/IniFile.h
@@ -137,6 +137,15 @@ public:
 		return this->FindValue(val) >= 0;
 	}
 
+	size_t LowerBound(const CString& key) const {
+		auto const it = value_pos.lower_bound(key);
+		if (it != value_pos.end()) {
+			return it->second;
+		}
+		return value_pairs.size();
+	}
+
+	// ==================== Modify
 	void SetString(const CString& key, const CString& value) {
 		return this->SetString(key, CString(value));
 	}
@@ -145,7 +154,7 @@ public:
 		auto const it = value_pos.find(key);
 		// new, never had one
 		if (it == value_pos.end()) {
-			this->Insert(key, std::move(value));
+			this->Append(key, std::move(value));
 			return;
 		}
 		value_pairs[it->second].second = std::move(value);
@@ -159,15 +168,31 @@ public:
 		this->SetString(key, INIHelper::ToString(val));
 	}
 
-	void Insert(const CString& key, const CString& value) {
-		this->Insert(key, CString(value));
+	void Append(const CString& key, const CString& value) {
+		this->Append(key, CString(value));
 	}
 
-	void Insert(const CString& key, CString&& value) {
+	void Append(const CString& key, CString&& value) {
 		value_pairs.push_back({ key, value });
 		value_pos.insert_or_assign(key, value_pairs.size() - 1);
 	}
 
+	void InsertAt(size_t idx, CString&& key, CString&& value) {
+		if (idx > value_pairs.size()) {
+			idx = value_pairs.size() - 1;
+		}
+		value_pairs.insert(value_pairs.begin() + idx, { key, value });
+		value_pos.insert_or_assign(key, idx);
+		// fix all indexes
+		for (auto it = value_pos.upper_bound(key); it != value_pos.end(); ++it) {
+			it->second++;
+		}
+	}
+	void Insert(CString&& key, CString&& value) {
+		auto const pos = LowerBound(key);
+		InsertAt(pos, std::move(key), std::move(value));
+	}
+
 	// ==================== Delete
 
 	void RemoveAt(size_t idx) {
@@ -309,7 +334,7 @@ public:
 
 	// ============== Writer and Helper converter ============================
 	CIniFileSection& AddSection(CString&& sectionName) {
-		auto const ret = this->sections.insert({ std::move(sectionName), {} });
+		auto const ret = this->sections.try_emplace(std::move(sectionName), CIniFileSection{});
 		return ret.first->second;
 	}
 	CIniFileSection& AddSection(const CString& sectionName) {
diff --git a/MissionEditor/Loading.cpp b/MissionEditor/Loading.cpp
index 984cb98..503a263 100644
--- a/MissionEditor/Loading.cpp
+++ b/MissionEditor/Loading.cpp
@@ -4216,7 +4216,7 @@ void CLoading::HackRules()
 			auto const pSec = rules.TryGetSection("BuildingTypes");
 			ASSERT(pSec != nullptr);
 			if (!pSec->HasValue(gateOne)) {
-				pSec->Insert(gateOne, gateOne);
+				pSec->Append(gateOne, gateOne);
 			}
 		}
 
diff --git a/UnitTest/CIni_Test.cpp b/UnitTest/CIni_Test.cpp
index fc2a8de..1895cac 100644
--- a/UnitTest/CIni_Test.cpp
+++ b/UnitTest/CIni_Test.cpp
@@ -237,4 +237,38 @@ CliffsWater2=112
 	EXPECT_EQ(0, file.GetInteger("NewUrbanInfo", "Morphable2"));
 	EXPECT_EQ(false, file["NewUrbanInfo"].Exists("Morphable2"));
 
+}
+
+TEST(CIniFileClass, IniLowerBoundInsertTest) {
+	auto const fileName = "test.ini";
+	IniTestHelper helper(fileName, R"(
+[Waypoints]
+0=123456
+1=456123
+2=123654
+5=789654
+6=654789
+10=159357
+
+)");
+
+	CIniFile file;
+	ASSERT_EQ(file.LoadFile(std::string(fileName)), 0);
+
+	EXPECT_EQ(123654, file.GetInteger("Waypoints", "2"));
+
+	auto const pSec = file.TryGetSection("Waypoints");
+	EXPECT_NE(pSec, nullptr);
+	auto const pos = pSec->LowerBound("4");
+	EXPECT_LE(pos, pSec->Size());
+	pSec->InsertAt(pos, "4", "432156");
+	EXPECT_EQ(432156, file.GetInteger("Waypoints", "4"));
+	EXPECT_EQ("432156", file["Waypoints"].Nth(3).second);
+	EXPECT_EQ("789654", file["Waypoints"].Nth(4).second);
+	pSec->Insert("9", "149367");
+	pSec->Insert("11", "987654");
+	EXPECT_EQ(149367, file.GetInteger("Waypoints", "9"));
+	EXPECT_EQ(987654, file.GetInteger("Waypoints", "11"));
+	EXPECT_EQ("987654", file["Waypoints"].Nth(pSec->Size() - 1).second);
+	EXPECT_EQ("159357", file["Waypoints"].Nth(pSec->Size() - 2).second);
 }
\ No newline at end of file