diff --git a/TileGenerator.cpp b/TileGenerator.cpp
index 559baed..83a0b01 100644
--- a/TileGenerator.cpp
+++ b/TileGenerator.cpp
@@ -246,6 +246,7 @@ void TileGenerator::generate(const std::string &input, const std::string &output
 		renderPlayers(input);
 	}
 	writeImage(output);
+	printUnknown();
 }
 
 void TileGenerator::openDb(const std::string &input)
@@ -468,6 +469,9 @@ inline void TileGenerator::renderMapBlock(const std::string &mapBlock, const Blo
 						m_readedPixels[z] |= (1 << x);
 						m_blockPixelAttributes.attribute(15 - z, xBegin + x).height = pos.y * 16 + y;
 					}
+					else {
+						m_unknownNodes.insert(name);
+					}
 					break;
 				}
 			}
@@ -637,6 +641,16 @@ void TileGenerator::writeImage(const std::string &output)
 	gdImageDestroy(m_image);
 }
 
+void TileGenerator::printUnknown()
+{
+	if (m_unknownNodes.size() > 0) {
+		std::cerr << "Unknown nodes:" << std::endl;
+		for (std::set<std::string>::iterator node = m_unknownNodes.begin(); node != m_unknownNodes.end(); ++node) {
+			std::cerr << *node << std::endl;
+		}
+	}
+}
+
 inline int TileGenerator::getImageX(int val) const
 {
 	return val + m_border;
diff --git a/TileGenerator.h b/TileGenerator.h
index 6a5ce29..cedf31a 100644
--- a/TileGenerator.h
+++ b/TileGenerator.h
@@ -16,6 +16,7 @@
 #include <sqlite3.h>
 #include <stdint.h>
 #include <string>
+#include <set>
 #include "PixelAttributes.h"
 
 struct Color {
@@ -101,6 +102,7 @@ private:
 	void renderOrigin();
 	void renderPlayers(const std::string &inputPath);
 	void writeImage(const std::string &output);
+	void printUnknown();
 	int getImageX(int val) const;
 	int getImageY(int val) const;
 
@@ -127,6 +129,7 @@ private:
 	std::map<int, std::string> m_nameMap;
 	ColorMap m_colors;
 	uint16_t m_readedPixels[16];
+	std::set<std::string> m_unknownNodes;
 
 	int m_blockAirId;
 	int m_blockIgnoreId;