diff --git a/README b/README
index 266dee3..cc19a7f 100644
--- a/README
+++ b/README
@@ -47,7 +47,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
 =*  mkfifo          yes                          none
 =*  mktemp          non-posix                    none
 =*  mv              yes                          none (-i)
-=*  nice            yes                          none
+=*| nice            yes                          none
 =   nl              no                           -d, -f, -h, -l, -p
 =*  nohup           yes                          none
 #*  paste           yes                          none
diff --git a/nice.1 b/nice.1
index a048f19..9c616a2 100644
--- a/nice.1
+++ b/nice.1
@@ -1,4 +1,4 @@
-.Dd January 28, 2015
+.Dd March 1, 2015
 .Dt NICE 1
 .Os sbase
 .Sh NAME
@@ -25,7 +25,7 @@ ranging from
 .Sy -20
 (highest priority)
 to
-.Sy +19
+.Sy +20
 (lowest priority).
 Default is 10.
 .El
diff --git a/nice.c b/nice.c
index 9f5b1a3..70a5c2d 100644
--- a/nice.c
+++ b/nice.c
@@ -16,8 +16,7 @@ usage(void)
 int
 main(int argc, char *argv[])
 {
-	long val = 10;
-	int savederrno;
+	int val = 10, r, savederrno;
 
 	ARGBEGIN {
 	case 'n':
@@ -28,20 +27,22 @@ main(int argc, char *argv[])
 		break;
 	} ARGEND;
 
-	if (argc == 0)
+	if (!argc)
 		usage();
 
 	errno = 0;
-	val += getpriority(PRIO_PROCESS, 0);
-	if (errno != 0)
+	r = getpriority(PRIO_PROCESS, 0);
+	if (errno)
 		weprintf("getpriority:");
-	val = MAX(PRIO_MIN, MIN(val, PRIO_MAX));
-	if (setpriority(PRIO_PROCESS, 0, val) != 0)
+	else
+		val += r;
+	LIMIT(val, PRIO_MIN, PRIO_MAX);
+	if (setpriority(PRIO_PROCESS, 0, val) < 0)
 		weprintf("setpriority:");
 
-	/* POSIX specifies the nice failure still invokes the command */
 	execvp(argv[0], argv);
 	savederrno = errno;
 	weprintf("execvp %s:", argv[0]);
-	return (savederrno == ENOENT)? 127 : 126;
+
+	return 126 + (savederrno == ENOENT);
 }
diff --git a/util.h b/util.h
index 4d89560..a107a07 100644
--- a/util.h
+++ b/util.h
@@ -13,6 +13,8 @@
 #define MIN(x,y)  ((x) < (y) ? (x) : (y))
 #undef MAX
 #define MAX(x,y)  ((x) > (y) ? (x) : (y))
+#undef LIMIT
+#define LIMIT(x, a, b)  (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
 
 #define LEN(x) (sizeof (x) / sizeof *(x))