sv.h: Clarify comment

diff --git a/sv.h b/sv.h
index 59ef698..c276243 100644 (file)
--- a/sv.h
+++ b/sv.h
@@ -1287,7 +1287,7 @@ object type. Exposed to perl code via Internals::SvREADONLY().
 
 #ifndef PERL_POISON
 /* Given that these two are new, there can't be any existing code using them
- *  as LVALUEs  */
+ *  as LVALUEs, so prevent that from happening  */
 #  define SvPVX_mutable(sv)    (0 + (sv)->sv_u.svu_pv)
 #  define SvPVX_const(sv)      ((const char*)(0 + (sv)->sv_u.svu_pv))
 #else