diff --git a/paddle/framework/ddim.h b/paddle/framework/ddim.h
index 675f8680f699cf52d6653ec51f6909f4be8e07fc..df26d73d481e85bcfcbd41dd1cde446b311cb595 100644
--- a/paddle/framework/ddim.h
+++ b/paddle/framework/ddim.h
@@ -81,6 +81,13 @@ std::vector<int> vectorize(const DDim& ddim);
 
 ssize_t product(const DDim& ddim);
 
+/**
+ * \brief Slice a ddim
+ *
+ * Slice dim with [begin, end).
+ * e.g.  DDim d = make_ddim({1,2,3,4,5});
+ *       slice_ddim(d, 1, 3); ====> {2,3}
+ */
 DDim slice_ddim(const DDim& dim, int begin, int end);
 
 /**