diff --git a/data.yml b/data.yml
index d43aff6037a2d5a9a3a65cff4ad07e4dcea7171e..2a5b4d0fd040667e40dee4bf560852850a314ca9 100644
--- a/data.yml
+++ b/data.yml
@@ -1,7 +1,6 @@
 requirements:
   - MUST have a blocking reading
   - MUST provide a baud rate options
-  - MUST have a blocking reading
   - SHOULD provide a interface with method for open, close, read, write
   - SHOULD provide the same interface of actual serial_bridge C++ implementation
   - MAY use the creates `serial` and `rust_mex`