diff --git a/tests/compat.sh b/tests/compat.sh
index cadc578..c3939b8 100755
--- a/tests/compat.sh
+++ b/tests/compat.sh
@@ -62,6 +62,7 @@
 #   avoid plain DES but keep 3DES-EDE-CBC (mbedTLS), DES-CBC3 (OpenSSL)
 # - ARIA: not in default config.h + requires OpenSSL >= 1.1.1
 # - ChachaPoly: requires OpenSSL >= 1.1.0
+# - 3DES: not in default config
 EXCLUDE='NULL\|DES-CBC-\|RC4\|3DES\|ARCFOUR\|ARIA\|CHACHA20-POLY1305'
 VERBOSE=""
 MEMCHECK=0