Update data.table.R

R/data.table.R

@@ -18,7 +18,7 @@ patterns = function(...) NULL
 measure = function(...) NULL
 # These are exported to prevent NOTEs from R CMD check, and checkUsage via compiler.
 # But also exporting them makes it clear (to users and other packages) that data.table uses these as symbols.
-# And NULL makes it clear (to the R's mask check on loading) that they're variables not functions.
+# The use of NULL during loading signals to R's mask check that these entities aren't defined with specific behaviors.
 # utils::globalVariables(c(".SD",".N")) was tried as well, but exporting seems better.
 # So even though .BY doesn't appear in this file, it should still be NULL here and exported because it's
 # defined in SDenv and can be used by users.