diff --git a/Startcode/matrix.h b/Startcode/matrix.h
index cc640d1..3b8340b 100644
--- a/Startcode/matrix.h
+++ b/Startcode/matrix.h
@@ -5,8 +5,11 @@
 
 typedef float MatrixType;
 
-// TODO Matrixtyp definieren
-
+typedef struct {
+  MatrixType *buffer;
+  unsigned int rows;
+  unsigned int cols;
+} Matrix;
 
 Matrix createMatrix(unsigned int rows, unsigned int cols);
 void clearMatrix(Matrix *matrix);