Add ChangeLog entry for deprecation of mbedtls_xxx_drbg_update
diff --git a/ChangeLog b/ChangeLog
index 7bea29d..7a497b0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -6,6 +6,13 @@
* Wipe sensitive buffers on the stack in the CTR_DRBG and HMAC_DRBG
modules.
+API Changes
+ * The new functions mbedtls_ctr_drbg_update_ret() and
+ mbedtls_hmac_drbg_update_ret() are similar to mbedtls_ctr_drbg_update()
+ and mbedtls_hmac_drbg_update() respectively, but the new functions
+ report errors whereas the old functions return void. We recommend that
+ applications use the new functions.
+
= mbed TLS 2.7.6 branch released 2018-08-31
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