diff --git a/docs/cpuif/internal_protocol.rst b/docs/cpuif/internal_protocol.rst
index dc9fc68..11789db 100644
--- a/docs/cpuif/internal_protocol.rst
+++ b/docs/cpuif/internal_protocol.rst
@@ -60,8 +60,7 @@ cpuif_rd_err
     should return an error response if possible.
 
 cpuif_rd_data
-    Read data. The width of this is bus is determined by the size of the largest
-    register in the design.
+    Read data. Is sampled on the same cycle that ``cpuif_rd_ack`` is asserted.
 
 Write Response
 ^^^^^^^^^^^^^^