Improve migration guide for SHA384 option
Signed-off-by: Mateusz Starzyk <mateusz.starzyk@mobica.com>
diff --git a/docs/3.0-migration-guide.d/modify_SHA384_option_behaviour.md b/docs/3.0-migration-guide.d/modify_SHA384_option_behaviour.md
index 0efe14a..fe6c75e 100644
--- a/docs/3.0-migration-guide.d/modify_SHA384_option_behaviour.md
+++ b/docs/3.0-migration-guide.d/modify_SHA384_option_behaviour.md
@@ -5,5 +5,8 @@
MBEDTLS_SHA512_NO_SHA384 was disabled by default, now MBEDTLS_SHA384_C is
enabled by default.
-If you were using a config file with MBEDTLS_SHA512_NO_SHA384 enabled,
-then just remove it (don't define MBEDTLS_SHA384_C).
+If you were using a config file with both MBEDTLS_SHA512_C and
+MBEDTLS_SHA512_NO_SHA384, then just remove the MBEDTLS_SHA512_NO_SHA384.
+If you were using a config file with MBEDTLS_SHA512_C and without
+MBEDTLS_SHA512_NO_SHA384 and you need the SHA-384 algorithm, then add
+`#define MBEDTLS_SHA384_C` to your config file.
