diff --git a/tests/compat.sh b/tests/compat.sh
index ba44cdb..63c1636 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -53,7 +53,12 @@
 VERIFIES="NO YES"
 TYPES="ECDSA RSA PSK"
 FILTER=""
-EXCLUDE='NULL\|DES-CBC-\|RC4\|ARCFOUR' # avoid plain DES but keep 3DES-EDE-CBC (mbedTLS), DES-CBC3 (OpenSSL)
+# exclude:
+# - NULL: excluded from our default config
+# - RC4, single-DES: requires legacy OpenSSL/GnuTLS versions
+#   avoid plain DES but keep 3DES-EDE-CBC (mbedTLS), DES-CBC3 (OpenSSL)
+# - ARIA: requires OpenSSL >= 1.1.1
+EXCLUDE='NULL\|DES-CBC-\|RC4\|ARCFOUR\|ARIA'
 VERBOSE=""
 MEMCHECK=0
 PEERS="OpenSSL$PEER_GNUTLS mbedTLS"
@@ -226,6 +231,9 @@
     G_CIPHERS=""
 }
 
+# Ciphersuites that can be used with all peers.
+# Since we currently have three possible peers, each ciphersuite should appear
+# three times: in each peer's list (with the name that this peer uses).
 add_common_ciphersuites()
 {
     case $TYPE in
@@ -422,6 +430,12 @@
     esac
 }
 
+# Ciphersuites usable only with Mbed TLS and OpenSSL
+# Each ciphersuite should appear two times, once with its OpenSSL name, once
+# with its Mbed TLS name.
+#
+# NOTE: for some reason RSA-PSK doesn't work with OpenSSL,
+# so RSA-PSK ciphersuites need to go in other sections.
 add_openssl_ciphersuites()
 {
     case $TYPE in
@@ -451,12 +465,16 @@
                     TLS-ECDH-ECDSA-WITH-AES-256-CBC-SHA384          \
                     TLS-ECDH-ECDSA-WITH-AES-128-GCM-SHA256          \
                     TLS-ECDH-ECDSA-WITH-AES-256-GCM-SHA384          \
+                    TLS-ECDHE-ECDSA-WITH-ARIA-256-GCM-SHA384        \
+                    TLS-ECDHE-ECDSA-WITH-ARIA-128-GCM-SHA256        \
                     "
                 O_CIPHERS="$O_CIPHERS               \
                     ECDH-ECDSA-AES128-SHA256        \
                     ECDH-ECDSA-AES256-SHA384        \
                     ECDH-ECDSA-AES128-GCM-SHA256    \
                     ECDH-ECDSA-AES256-GCM-SHA384    \
+                    ECDHE-ECDSA-ARIA256-GCM-SHA384  \
+                    ECDHE-ECDSA-ARIA128-GCM-SHA256  \
                     "
             fi
             ;;
@@ -470,13 +488,42 @@
                 DES-CBC-SHA                     \
                 EDH-RSA-DES-CBC-SHA             \
                 "
+            if [ `minor_ver "$MODE"` -ge 3 ]
+            then
+                M_CIPHERS="$M_CIPHERS                               \
+                    TLS-ECDHE-RSA-WITH-ARIA-256-GCM-SHA384          \
+                    TLS-DHE-RSA-WITH-ARIA-256-GCM-SHA384            \
+                    TLS-ECDHE-RSA-WITH-ARIA-128-GCM-SHA256          \
+                    TLS-DHE-RSA-WITH-ARIA-128-GCM-SHA256            \
+                    "
+                O_CIPHERS="$O_CIPHERS               \
+                    ECDHE-ARIA256-GCM-SHA384        \
+                    DHE-RSA-ARIA256-GCM-SHA384      \
+                    ECDHE-ARIA128-GCM-SHA256        \
+                    DHE-RSA-ARIA128-GCM-SHA256      \
+                    "
+            fi
             ;;
 
         "PSK")
+            if [ `minor_ver "$MODE"` -ge 3 ]
+            then
+                M_CIPHERS="$M_CIPHERS                               \
+                    TLS-PSK-WITH-ARIA-256-GCM-SHA384                \
+                    TLS-PSK-WITH-ARIA-128-GCM-SHA256                \
+                    "
+                O_CIPHERS="$O_CIPHERS               \
+                    PSK-ARIA256-GCM-SHA384          \
+                    PSK-ARIA128-GCM-SHA256          \
+                    "
+            fi
             ;;
     esac
 }
 
+# Ciphersuites usable only with Mbed TLS and GnuTLS
+# Each ciphersuite should appear two times, once with its GnuTLS name, once
+# with its Mbed TLS name.
 add_gnutls_ciphersuites()
 {
     case $TYPE in
@@ -661,6 +708,9 @@
     esac
 }
 
+# Ciphersuites usable only with Mbed TLS (not currently supported by another
+# peer usable in this script). This provide only very rudimentaty testing, as
+# this is not interop testing, but it's better than nothing.
 add_mbedtls_ciphersuites()
 {
     case $TYPE in
@@ -682,9 +732,7 @@
                     TLS-ECDHE-ECDSA-WITH-AES-256-CCM                \
                     TLS-ECDHE-ECDSA-WITH-AES-128-CCM-8              \
                     TLS-ECDHE-ECDSA-WITH-AES-256-CCM-8              \
-                    TLS-ECDHE-ECDSA-WITH-ARIA-256-GCM-SHA384        \
                     TLS-ECDHE-ECDSA-WITH-ARIA-256-CBC-SHA384        \
-                    TLS-ECDHE-ECDSA-WITH-ARIA-128-GCM-SHA256        \
                     TLS-ECDHE-ECDSA-WITH-ARIA-128-CBC-SHA256        \
                     "
             fi
@@ -702,12 +750,8 @@
                     TLS-RSA-WITH-AES-256-CCM-8                      \
                     TLS-DHE-RSA-WITH-AES-128-CCM-8                  \
                     TLS-DHE-RSA-WITH-AES-256-CCM-8                  \
-                    TLS-ECDHE-RSA-WITH-ARIA-256-GCM-SHA384          \
-                    TLS-DHE-RSA-WITH-ARIA-256-GCM-SHA384            \
                     TLS-ECDHE-RSA-WITH-ARIA-256-CBC-SHA384          \
                     TLS-DHE-RSA-WITH-ARIA-256-CBC-SHA384            \
-                    TLS-ECDHE-RSA-WITH-ARIA-128-GCM-SHA256          \
-                    TLS-DHE-RSA-WITH-ARIA-128-GCM-SHA256            \
                     TLS-ECDHE-RSA-WITH-ARIA-128-CBC-SHA256          \
                     TLS-DHE-RSA-WITH-ARIA-128-CBC-SHA256            \
                     "
@@ -738,14 +782,12 @@
                     TLS-PSK-WITH-AES-256-CCM-8                      \
                     TLS-DHE-PSK-WITH-AES-128-CCM-8                  \
                     TLS-DHE-PSK-WITH-AES-256-CCM-8                  \
-                    TLS-RSA-PSK-WITH-ARIA-256-GCM-SHA384            \
                     TLS-RSA-PSK-WITH-ARIA-256-CBC-SHA384            \
-                    TLS-RSA-PSK-WITH-ARIA-128-GCM-SHA256            \
                     TLS-RSA-PSK-WITH-ARIA-128-CBC-SHA256            \
-                    TLS-PSK-WITH-ARIA-256-GCM-SHA384                \
                     TLS-PSK-WITH-ARIA-256-CBC-SHA384                \
-                    TLS-PSK-WITH-ARIA-128-GCM-SHA256                \
                     TLS-PSK-WITH-ARIA-128-CBC-SHA256                \
+                    TLS-RSA-PSK-WITH-ARIA-256-GCM-SHA384            \
+                    TLS-RSA-PSK-WITH-ARIA-128-GCM-SHA256            \
                     "
             fi
             ;;