Expand example/jsonptr memory safety comment
diff --git a/example/jsonptr/jsonptr.cc b/example/jsonptr/jsonptr.cc
index dad552d..12b66d3 100644
--- a/example/jsonptr/jsonptr.cc
+++ b/example/jsonptr/jsonptr.cc
@@ -34,8 +34,8 @@
use-after-frees.
The core JSON implementation is also written in the Wuffs programming language
-(and then transpiled to C/C++), which is memory-safe but also guards against
-integer arithmetic overflows.
+(and then transpiled to C/C++), which is memory-safe (e.g. array indexing is
+bounds-checked) but also guards against integer arithmetic overflows.
For defense in depth, on Linux, this program also self-imposes a
SECCOMP_MODE_STRICT sandbox before reading (or otherwise processing) its input
