update cran comments

cran-comments.md

@@ -6,10 +6,21 @@
 ## R CMD check results
 here were no ERRORs and no WARNINGs
 
-There was one NOTE:
+There was one NOTE on the local OS X and windows check:
 * checking CRAN incoming feasibility ... NOTE
 Maintainer: ‘Ella Kaye <[email protected]>’
 
+There was one NOTE on the linux check (on Travis-CI):
+* checking installed package size ... NOTE
+  installed size is  5.7Mb
+  sub-directories of 1Mb or more:
+    libs   5.4Mb
+
+This NOTE does not appear on the OS X or windows check. 
+Moreover, this NOTE also did not appear when checking on a local linux environment (using platform: i686-pc-linux-gnu (32-bit))
+
+My understanding is that this inflation of the libs subdirectory is due to the use of Rcpp. Indeed, some functions of the BradleyTerryScalable package have been written in C++ using Rcpp. They are needed to fit the Bradley-Terry model to large datasets. Without the speed up gained from those C++ functions, this package would not be fit for purpose.
+
 New submission
 
 ## First submission