diff --git a/ChangeLog.d/dhm-fields.txt b/ChangeLog.d/dhm-fields.txt
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@@ -0,0 +1,7 @@
+Features
+   * The new functions mbedtls_dhm_get_len() and mbedtls_dhm_get_bitlen()
+     query the size of the modulus in a Diffie-Hellman context.
+
+API changes
+   * Instead of accessing the len field of a DHM context, which is no longer
+     supported, use the new function mbedtls_dhm_get_len() .