Add test/zeroize.c
diff --git a/programs/README.md b/programs/README.md
index d8e4cd6..eb25a7f 100644
--- a/programs/README.md
+++ b/programs/README.md
@@ -103,6 +103,8 @@
* [`test/udp_proxy.c`](test/udp_proxy.c): a UDP proxy that can inject certain failures (delay, duplicate, drop). Useful for testing DTLS.
+* [`test/zeroize.c`](test/zeroize.c): a test program for `mbedtls_platform_zeroize`, used by [`tests/scripts/test_zeroize.gdb`](tests/scripts/test_zeroize.gdb).
+
## Development utilities
* [`util/pem2der.c`](util/pem2der.c): a PEM to DER converter. Mbed TLS can read PEM files directly, but this utility can be useful for interacting with other tools or with minimal Mbed TLS builds that lack PEM support.