diff --git a/ls.1 b/ls.1
index eb0b015..0c61721 100644
--- a/ls.1
+++ b/ls.1
@@ -24,6 +24,9 @@ print the index number of each file.
 lists detailed information about each file, including their type, permissions,
 links, owner, group, size, and modification time.
 .TP
+.B \-r
+reverses the sort order.
+.TP
 .B \-t
 sorts files by modification time instead of by name.
 .TP
diff --git a/ls.c b/ls.c
index 98b4c3c..bc2ea4f 100644
--- a/ls.c
+++ b/ls.c
@@ -35,6 +35,7 @@ static bool iflag = false;
 static bool lflag = false;
 static bool tflag = false;
 static bool Uflag = false;
+static int sortorder = 1;
 static bool first = true;
 static bool many;
 
@@ -63,6 +64,9 @@ main(int argc, char *argv[])
 	case 'l':
 		lflag = true;
 		break;
+	case 'r':
+		sortorder = -1;
+		break;
 	case 't':
 		tflag = true;
 		break;
@@ -94,9 +98,9 @@ entcmp(const void *va, const void *vb)
 	const Entry *a = va, *b = vb;
 
 	if(tflag)
-		return b->mtime - a->mtime;
+		return sortorder * (b->mtime - a->mtime);
 	else
-		return strcmp(a->name, b->name);
+		return sortorder * (strcmp(a->name, b->name));
 }
 
 void