diff --git a/HACKS.rst b/HACKS.rst
new file mode 100644
index 00000000..477fddeb
--- /dev/null
+++ b/HACKS.rst
@@ -0,0 +1,28 @@
+Hacks of External libraries
+===========================
+
+
+Hack of jansson
+===============
+
+Function that return the pointer of a json integer
+--------------------------------------------------
+
+Let quick access to write and read integer values
+
+diff -r jansson-2.14/src/jansson.h jansson-2.14-gines/src/jansson.h
+316a317,318
+> json_int_t *json_integer_value_pointer(const json_t *integer);
+>
+
+diff -r jansson-2.14/src/value.c jansson-2.14-gines/src/value.c
+901a902,908
+> json_int_t *json_integer_value_pointer(const json_t *json) {
+>     if (!json_is_integer(json))
+>         return 0;
+>
+>     return &(json_to_integer(json)->value);
+> }
+>
+
+
diff --git a/src/jansson.h b/src/jansson.h
index 391c85e9..d223398a 100644
--- a/src/jansson.h
+++ b/src/jansson.h
@@ -314,6 +314,8 @@ json_int_t json_integer_value(const json_t *integer);
 double json_real_value(const json_t *real);
 double json_number_value(const json_t *json);
 
+json_int_t *json_integer_value_pointer(const json_t *integer);
+
 int json_string_set(json_t *string, const char *value);
 int json_string_setn(json_t *string, const char *value, size_t len);
 int json_string_set_nocheck(json_t *string, const char *value);
diff --git a/src/value.c b/src/value.c
index d5a11fe5..45f87584 100644
--- a/src/value.c
+++ b/src/value.c
@@ -907,6 +907,12 @@ json_int_t json_integer_value(const json_t *json) {
     return json_to_integer(json)->value;
 }
 
+json_int_t *json_integer_value_pointer(const json_t *json) {
+    if (!json_is_integer(json))
+        return 0;
+    return &(json_to_integer(json)->value);
+}
+
 int json_integer_set(json_t *json, json_int_t value) {
     if (!json_is_integer(json))
         return -1;