Add ChangeLog entry
diff --git a/ChangeLog b/ChangeLog
index 2f0116b..0c8f541 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,27 @@
mbed TLS ChangeLog (Sorted per branch, date)
+= mbed TLS x.x.x released xxxx-xx-xx
+
+Bugfix
+ * Fix the entropy.c module to not call mbedtls_sha256_starts() or
+ mbedtls_sha512_starts() in the mbedtls_entropy_init() function.
+ * Fix the entropy.c module to ensure that mbedtls_sha256_init() or
+ mbedtls_sha512_init() is called before operating on the relevant context
+ structure. Also, ensure that message digest contexts are freed when
+ calling mbedtls_entropy_free().
+
+API Changes
+ * The following functions in the MD2, MD4, MD5, SHA1, SHA256 and SHA512
+ modules have been deprecated and replaced as shown below. The new
+ functions change the return type from void to int to allow returning error
+ codes when using MBEDTLS_<MODULE>_ALT.
+ mbedtls_<MODULE>_starts() -> mbedtls_<MODULE>_starts_ext()
+ mbedtls_<MODULE>_update() -> mbedtls_<MODULE>_update_ext()
+ mbedtls_<MODULE>_finish() -> mbedtls_<MODULE>_finish_ext()
+ mbedtls_<MODULE>_process() -> mbedtls_internal_<MODULE>_process()
+ The type of the function pointers in the mbedtls_md_info_t struct have
+ also been modified taking into account the functions return code.
+
= mbed TLS 2.5.1 released 2017-06-21
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