diff --git a/README.md b/README.md
index 94d9974..24e1435 100644
--- a/README.md
+++ b/README.md
@@ -352,3 +352,14 @@ TinySTL
 |std::list<int>|1万|1.25|  
 |std::list<int>|10万|35.692|  
 |std::list<int>|100万|665.128|  
+
+
+####(12):suffix_array
+
+    char arr[] = { 'a', 'a', 'b', 'a', 'a', 'a', 'a', 'b' };
+
+    TinySTL::suffix_array sa(arr, 8);
+	auto v = sa.suffixArray();
+	auto t = std::vector<int> {3, 4, 5, 0, 6, 1, 7, 2};
+	assert(TinySTL::Test::container_equal(v, t));
+