diff --git a/articles/Convolution - Wikipedia/Convolution - Wikipedia.pdf.txt b/articles/Convolution - Wikipedia/Convolution - Wikipedia.pdf.txt
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+++ b/articles/Convolution - Wikipedia/Convolution - Wikipedia.pdf.txt	
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diff --git a/articles/Convolution - Wikipedia/Convolution - Wikipedia.xopp.xml b/articles/Convolution - Wikipedia/Convolution - Wikipedia.xopp.xml
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+      <text font="Sans" size="11.00000000" x="39.63875281" y="171.30422418" color="#00c0ffff" ts="0" fn="">but is not there possibly some kind of constant shift?</text>
+      <text font="Sans" size="11.00000000" x="115.27580209" y="32.33256515" color="#00c0ffff" ts="0" fn="">assuming the process of convolution computation, I agree that f * g and g * f are
+identical (except possibly by a constant shift see below) as both f and g are reflected</text>
+      <text font="Sans" size="11.00000000" x="331.82704026" y="305.73143569" color="#00c0ffff" ts="0" fn="">to check especially from a reflection point of view
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