Fix trivial syntax failure
diff --git a/src/org/zeroxlab/benchmark/CaseCanvas.java b/src/org/zeroxlab/benchmark/CaseCanvas.java
index e27f95b..5d5164c 100644
--- a/src/org/zeroxlab/benchmark/CaseCanvas.java
+++ b/src/org/zeroxlab/benchmark/CaseCanvas.java
@@ -52,7 +52,7 @@
     }
 
     public String getDescription() {
-        return "call canvas.drawRGB to fill the canvas repeatedly. "
+        return "call canvas.drawRGB to fill the canvas repeatedly. " +
                "It redraw for " + CanvasRound + " times";
     }