diff --git a/v2_0_cpp_adaptor.md b/v2_0_cpp_adaptor.md
index d145c58..32590f9 100644
--- a/v2_0_cpp_adaptor.md
+++ b/v2_0_cpp_adaptor.md
@@ -16,6 +16,8 @@ msgpack-c provides predefined adaptors for C++ primitive types and standard libr
 | char              | positive/negative integer   |    |
 | signed ints *1    | positive/negative integer   |    |
 | unsigned ints *2  | positive integer            |    |
+| float             | float32                     |since 2.1.0|
+| double            | float64                     |    |
 | std::list         | array                       |    |
 | std::map          | array                       |    |
 | std::pair         | array                       |    |