diff --git a/doc/zzuf.1 b/doc/zzuf.1
index 4903427..da3e955 100644
--- a/doc/zzuf.1
+++ b/doc/zzuf.1
@@ -8,7 +8,7 @@ zzuf \- multiple purpose fuzzer
 .br
                [\fB\-P\fR \fIprotect\fR] [\fB\-R\fR \fIrefuse\fR]
 .br
-               [\fB\-I\fR \fIinclude\fR] [\fB\-E\fR \fIexclude\fR] \fIPROGRAM\fR [\fIARGS\fR]...
+               [\fB\-I\fR \fIinclude\fR] [\fB\-E\fR \fIexclude\fR] [\fIPROGRAM\fR [\fIARGS\fR]...]
 .br
 \fBzzuf \-h\fR | \fB\-\-help\fR
 .br
@@ -31,6 +31,11 @@ marker before them on the command line (otherwise \fBzzuf\fR will try to
 interpret them as arguments for itself), eg:
 .PP
 \fB    zzuf \-B 1000 cat \-\- \-v /dev/zero\fR
+.PP
+When no program is specified, \fBzzuf\fR simply fuzzes the standard input, as
+if the \fBcat\fR utility had been called:
+.PP
+\fB    zzuf < /dev/zero\fR
 .SH OPTIONS
 .TP
 \fB\-B\fR, \fB\-\-max\-bytes\fR=\fIn\fR
@@ -269,7 +274,7 @@ Linux-specific:
 \fBgetline\fR(), \fBgetdelim\fR(), \fB__getdelim\fR()
 .TP
 BSD-specific:
-\fBfgetln\fR(), \fB__srefill()\fR()
+\fBfgetln\fR(), \fB__srefill\fR()
 .TP
 Signal handling:
 \fBsignal\fR(), \fBsigaction\fR()
diff --git a/src/zzuf.c b/src/zzuf.c
index 5adca30..e3d2759 100644
--- a/src/zzuf.c
+++ b/src/zzuf.c
@@ -609,7 +609,7 @@ static void usage(void)
     printf("Usage: zzuf [-cdinqS] [-r ratio] [-s seed | -s start:stop]\n");
     printf("                      [-F forks] [-C crashes] [-B bytes] [-T seconds]\n");
     printf("                      [-P protect] [-R refuse]\n");
-    printf("                      [-I include] [-E exclude] COMMAND [ARGS]...\n");
+    printf("                      [-I include] [-E exclude] [PROGRAM [ARGS]...]\n");
 #   ifdef HAVE_GETOPT_LONG
     printf("       zzuf -h | --help\n");
     printf("       zzuf -v | --version\n");
diff --git a/test/testsuite.sh b/test/testsuite.sh
index b21f3c2..a99878a 100755
--- a/test/testsuite.sh
+++ b/test/testsuite.sh
@@ -86,13 +86,14 @@ for r in 0.0 0.00001 0.001 0.1 10.0; do
         echo "*** file $file, ratio $r ***"
         OK=1
         MD5=""
+        check "$ZZOPTS" "< $file" "zzuf"
         check "$ZZOPTS" "$FDCAT $file" "fdcat"
         check "$ZZOPTS" "$STREAMCAT $file" "streamcat"
         if [ "$STATIC_CAT" = "" ]; then
             check "$ZZOPTS" "cat $file" "cat"
             check "$ZZOPTS" "-i cat < $file" "|cat"
         fi
-        if [ "$STATIC_CAT" = "" ]; then
+        if [ "$STATIC_DD" = "" ]; then
             check "$ZZOPTS" "dd bs=65536 if=$file" "dd(bs=65536)"
             check "$ZZOPTS" "dd bs=1111 if=$file" "dd(bs=1111)"
             check "$ZZOPTS" "dd bs=1024 if=$file" "dd(bs=1024)"