diff --git a/docs/source/devices/devices.rst b/docs/source/devices/devices.rst
index 92d06101a08c0f0e024beb6de69afca0af957272..dfe7f011e8e6777304002c33b89fd2fe5e31049a 100644
--- a/docs/source/devices/devices.rst
+++ b/docs/source/devices/devices.rst
@@ -63,6 +63,10 @@ Complex values which cannot be represented in Tango attributes. Instead, the XST
 
   :type: ``int64[N_blocks][block_size]``
 
+:xst_conjugated_R: Whether the block contains conjugated data. If so, it must be conjugated again on interpretation.
+
+  :type: ``bool[N_blocks]``
+
 :xst_timestamp_R: Timestamp of each block.
 
   :type: ``int64[N_blocks]``