diff --git a/src/sys/s7.s b/src/sys/s7.s
index 81034bb..27f1139 100644
--- a/src/sys/s7.s
+++ b/src/sys/s7.s
@@ -114,7 +114,7 @@ dsprestart:
    isz ttydelay
    krb			" read keyboard buffer
    dac char		" save in char
-   sad o375		" interrupt char ('}'?)
+   sad o375		" interrupt char (TTY ALT MODE?)
    jmp intrp1		"  yes
    lac d1
    jms putchar