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diff --git a/help/pix_opencv_contours_convexity-help.pd b/help/pix_opencv_contours_convexity-help.pd
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+#X text 26 175 Arguments:;
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+#X text 22 38 Class: pix_opencv;
+#X text 23 22 Synopsis: [pix_opencv_calibration];
+#X text 47 195 none;
+#X text 26 86 pix_opencv_contours_convexity :: Finds convexity defects
+of the bigest contour of a binary image.;
+#X text 25 228 This object considers a contour to be analyzed any group
+of white pixels in a black background \, for this reason you will find
+useful to use pix_threshold to obtain a correct input for pix_opencv_contours_boundingrect.
+;
+#X text 26 281 pix_opencv_contours_boundingrect works detecting the
+bigest white area in the input image \, sometimes you will need to
+use pix_opencv_morphology to transform the contours of the shape to
+be analyzed..;
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+#X text 819 589 Start point (X -Y);
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+#X text 730 445 number convexity defects in our detected contour;
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+convexity defects we have ::;
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+#X text 652 347 <- Set the background reference;
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+#X text 74 445 please consider the use of pix_opencv_contours;
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