diff --git a/Makefile b/Makefile
index da527bd..8ea7b2c 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ $(OBJ_DIR):
 	mkdir -p $(OBJ_DIR)
 
 # Benchmark rules
-$(BENCH_TARGET): $(BENCH_OBJ_DIR)/bench.o $(BENCH_OBJ_DIR)/vector.o $(BENCH_OBJ_DIR)/map.o $(BENCH_OBJ_DIR)/bigint.o
+$(BENCH_TARGET): $(BENCH_OBJ_DIR)/bench.o $(BENCH_OBJ_DIR)/vector.o $(BENCH_OBJ_DIR)/map.o $(BENCH_OBJ_DIR)/bigint.o $(BENCH_OBJ_DIR)/string.o
 	$(CC) $(BENCH_FLAGS) -o $@ $^
 
 $(BENCH_OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(BENCH_OBJ_DIR)
diff --git a/README.md b/README.md
index 3544300..6391f41 100644
--- a/README.md
+++ b/README.md
@@ -187,14 +187,16 @@ $ ./test_bigint
 ```
 
 ## Benchmark
-Under the [`benchmark/`](/benchmark/) folder, you can find a simple benchmark program that stress the `Vector` and the `Map` data structures. You can run it by issuing the following command:
+Under the [`benchmark/`](/benchmark/) folder, you can find a very simple benchmark program that stress the data structures. 
+You can run it by issuing the following command:
 
 ```sh
 $ make clean all CC=clang
 $ ./benchmark_datum
-omputing Vector average time...average time: 8 ms
-Computing Map average time...average time: 53 ms
-Computing BigInt average time...average time: 76 ms
+Computing Vector average time...average time: 6 ms
+Computing Map average time...average time: 49 ms
+Computing BigInt average time...average time: 67 ms
+Computing String average time...average time: 13 ms
 ```
 
 
diff --git a/benchmark/benchmark.c b/benchmark/benchmark.c
index f083ca1..6bf1746 100644
--- a/benchmark/benchmark.c
+++ b/benchmark/benchmark.c
@@ -7,6 +7,7 @@
 #include "../src/vector.h"
 #include "../src/map.h"
 #include "../src/bigint.h"
+#include "../src/string.h"
 
 typedef void (*test_fn_t)(size_t iterations);
 
@@ -116,6 +117,31 @@ void test_bigint(size_t iterations) {
     }
 }
 
+void test_string(size_t iterations) {
+    volatile size_t total_len = 0;
+
+    for (size_t idx = 0; idx < iterations; idx++) {
+        string_t *str1 = string_new("hello").value.string;
+        string_t *str2 = string_new(" World").value.string;
+
+        string_result_t concat = string_concat(str1, str2);
+        string_result_t upper = string_to_upper(concat.value.string);
+        total_len += string_size(upper.value.string);
+        string_result_t needle = string_new("WORLD");
+        string_result_t contains = string_contains(upper.value.string, needle.value.string);
+
+        if (contains.value.idx >= 0) {
+            total_len += contains.value.idx;
+        }
+
+        string_destroy(str1);
+        string_destroy(str2);
+        string_destroy(concat.value.string);
+        string_destroy(upper.value.string);
+        string_destroy(needle.value.string);
+    }
+}
+
 static inline uint64_t now_ns(void) {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);
@@ -155,5 +181,9 @@ int main(void) {
     fflush(stdout);
     printf("average time: %lld ms\n", benchmark(test_bigint, 1e5, 30));
 
+    printf("Computing String average time...");
+    fflush(stdout);
+    printf("average time: %lld ms\n", benchmark(test_string, 1e5, 30));
+
     return 0;
 }