diff --git a/AMDiS/src/Assembler.cc b/AMDiS/src/Assembler.cc
index 8cf02ef712846022a0e5393319945275a42f4c12..4002183deb62b05376550ef72678b90ac28aa652 100644
--- a/AMDiS/src/Assembler.cc
+++ b/AMDiS/src/Assembler.cc
@@ -324,7 +324,7 @@ namespace AMDiS {
       calculateElementMatrix(elInfo, elementMatrix);
     }
 
-    // vec = elementMatrix*uhOldLoc;
+    // vec += elementMatrix*uhOldLoc;
     for (int i = 0; i < nRow; i++) {
       double val = 0.0;
       for (int j = 0; j < nCol; j++)