Fix 1998/schweikh1/README.md

I had updated it after a commit and thought I did a commit -v --amend
but apparently I did not (or I missed the README.md though I thought I
did '.'). Thus the README.md was not as it should be.

1998/schweikh1/README.md

@@ -54,7 +54,11 @@ respectively, 44 and 46.  But how does this work? Well the string is:
 
 The first number means: the length starting from 0 up through the `>`. The
 second number is the same starting point but up through the `\0` which is why
-it's +2.
+it's +2. Somehow it was basic intuition that made me figure out these two
+numbers and a quick test confirmed it. But what happens if only the first number
+is updated? Most of the output will be just `#define` by itself; in the cases
+where there was text after that it was macros that certainly were not defined.
+There might have been other errors as well.
 
 This allows for opening the right files. The problem with the macOS is
 `/usr/include` does not exist: instead it's