diff --git a/man/remind.1.in b/man/remind.1.in
index 940db458..660b9e45 100644
--- a/man/remind.1.in
+++ b/man/remind.1.in
@@ -6469,6 +6469,20 @@ as:
     FSET subst_bx(a,d,t) iif(d==today()+2, "the day after tomorrow", 0)
 .fi
 .PP
+You can override substitution sequences that are not alphanumeric as follows:
+.RS
+.PP
+Override %: with \fBsubst_colon\fR
+.PP
+Override %! with \fBsubst_bang\fR
+.PP
+Override %? with \fBsubst_question\fR
+.PP
+Override %@ with \fBsubst_at\fR
+.PP
+Override %# with \fBsubst_hash\fR
+.RE
+.PP
 You can define your own substitution sequences in addition to the built-in
 ones as follows:  If you define a function named \fBsubst_\fIname\fB(alt, date, time)\fR, then the sequence \fB%{name}\fR calls the function with \fBalt\fR
 set to 0 and \fBdate\fR and \fBtime\fR to the trigger date and time,
diff --git a/tests/test.cmp b/tests/test.cmp
index ed1d0bab..a9a26b80 100644
--- a/tests/test.cmp
+++ b/tests/test.cmp
@@ -16580,12 +16580,13 @@ Entering UserFN c()
 Leaving UserFN c() => 33
 
 DEBUG -xe
+Overridden: subst_colon subst_bang subst_question subst_at subst_hash
 Variable hash table statistics:
   Entries: 100144; Buckets: 87719; Non-empty Buckets: 66301
   Maxlen: 5; Minlen: 0; Avglen: 1.142; Stddev: 0.878; Avg nonempty len: 1.510
   Growths: 13; Shrinks: 0
 Function hash table statistics:
-  Entries: 100018; Buckets: 87719; Non-empty Buckets: 63574
+  Entries: 100023; Buckets: 87719; Non-empty Buckets: 63576
   Maxlen: 5; Minlen: 0; Avglen: 1.140; Stddev: 0.934; Avg nonempty len: 1.573
   Growths: 13; Shrinks: 0
 Dedupe hash table statistics:
diff --git a/tests/test.rem b/tests/test.rem
index 85f2c3c2..00369bc8 100644
--- a/tests/test.rem
+++ b/tests/test.rem
@@ -1707,6 +1707,15 @@ set a c()
 
 DEBUG -xe
 
+fset subst_colon(a, b, c) "subst_colon"
+fset subst_bang(a, b, c) "subst_bang"
+fset subst_question(a, b, c) "subst_question"
+fset subst_at(a, b, c) "subst_at"
+fset subst_hash(a, b, c) "subst_hash"
+
+REM MSG Overridden: %: %! %? %@ %#
+
+
 # Don't want Remind to queue reminders
 EXIT