diff --git a/opencv.html.markdown b/opencv.html.markdown
index 5d860eca..b083feb8 100644
--- a/opencv.html.markdown
+++ b/opencv.html.markdown
@@ -114,13 +114,15 @@ eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
 img = cv2.imread('human.jpg')
 gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
 
-aces = face_cascade.detectMultiScale(gray, 1.3, 5)
+faces = face_cascade.detectMultiScale(gray, 1.3, 5)
 for (x,y,w,h) in faces:
+    # Draw a rectangle around detected face
     cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
     roi_gray = gray[y:y+h, x:x+w]
     roi_color = img[y:y+h, x:x+w]
     eyes = eye_cascade.detectMultiScale(roi_gray)
     for (ex,ey,ew,eh) in eyes:
+        # Draw a rectangle around detected eyes
         cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)
 
 cv2.imshow('img',img)