diff --git a/doc/api/array.h.md b/doc/api/array.h.md
index d3f5a12faa..717522c626 100644
--- a/doc/api/array.h.md
+++ b/doc/api/array.h.md
@@ -1 +1,14 @@
+### mrb_ary_new
 
+```C
+mrb_value mrb_ary_new(mrb_state *mrb);
+```
+
+Initializes an array.
+
+#### Example
+
+example.c
+```C
+
+```