Fix parenthesissubmission-w1.1

1 files changed, 1 insertions, 1 deletions

diff --git a/worksheets/a1_textrain.md b/worksheets/a1_textrain.md
index 7849594..2f9c64f 100644
--- a/worksheets/a1_textrain.md
+++ b/worksheets/a1_textrain.md
@@ -73,7 +73,7 @@ final int threshold = 128;
 
 // Returns: thresholded color (black or white)
 color thresholdPixel(color inputPixel) {
-  if blue(inputPixel) < threshold {
+  if (blue(inputPixel) < threshold) {
     return color(0);
   } else {
     return color(255);