diff -r c5830bce1c23 -r e07425ac5834 src/ldrawalgorithm.cpp
--- a/src/ldrawalgorithm.cpp	Wed Jul 20 12:59:07 2022 +0300
+++ b/src/ldrawalgorithm.cpp	Wed Jul 20 21:34:56 2022 +0300
@@ -1,3 +1,4 @@
+#include <QTextBlock>
 #include "src/ldrawalgorithm.h"
 
 std::pair<Triangle, Triangle> splitTriangles(
@@ -20,28 +21,25 @@
 std::vector<ModelAction> ldraw::makeUnofficial(const Model* model)
 {
 	std::vector<ModelAction> actions;
-#if 0
-	if (model->size() >= 4) {
-		if (const Comment* comment = std::get_if<Comment>(&(*model)[3])) {
-			const QString& body = comment->text;
-			if (body.startsWith("!LDRAW_ORG ") and not body.startsWith("!LDRAW_ORG Unofficial_"))
+	constexpr int ldrawOrgLinePosition = 3;
+	const QTextBlock block = model->findBlockByLineNumber(ldrawOrgLinePosition);
+	if (block.isValid()) {
+		const QString body = block.text().simplified();
+		if (body.startsWith("0 !LDRAW_ORG ") and not body.startsWith("0 !LDRAW_ORG Unofficial_")) {
+			// Add Unofficial_ to part type
+			QStringList tokens = body.split(" ");
+			tokens[2] = "Unofficial_" + tokens[2];
+			// Remove the UPDATE tag if it's there
+			if (tokens.size() >= 5 && tokens[3] == "UPDATE")
 			{
-				// Add Unofficial_ to part type
-				QStringList tokens = body.split(" ");
-				tokens[1] = "Unofficial_" + tokens[1];
-				// Remove the UPDATE tag if it's there
-				if (tokens.size() >= 4 && tokens[2] == "UPDATE")
-				{
-					tokens.removeAt(3);
-					tokens.removeAt(2);
-				}
-				actions.push_back(ModifyModel{
-					.position = 3,
-					.newElement = Comment{.text = tokens.join(" ")}
-				});
+				tokens.removeAt(4);
+				tokens.removeAt(3);
 			}
+			actions.push_back(ModifyModel{
+				.position = ldrawOrgLinePosition,
+				.newElement = Comment{.text = tokens.mid(1).join(" ")}
+			});
 		}
 	}
-#endif
 	return actions;
 }