doc: clarify a comment in system.h

* src/system.h (STRNCMP_LIT): Clarify comment.
Suggested by Bruno Haible.

diff --git a/src/system.h b/src/system.h
index c4f262d..f312f88 100644 (file)
--- a/src/system.h
+++ b/src/system.h
@@ -186,7 +186,7 @@ select_plural (uintmax_t n)
 #define STRPREFIX(a, b) (strncmp(a, b, strlen (b)) == 0)
 
 /* Just like strncmp, but the second argument must be a literal string
-   and you don't specify the length.  */
+   and you don't specify the length;  that comes from the literal.  */
 #define STRNCMP_LIT(s, literal) \
   strncmp (s, "" literal "", sizeof (literal) - 1)