added english language description for Subtract From Extended instruction

diff --git a/openpower/isa/fixedarith.mdwn b/openpower/isa/fixedarith.mdwn
index a4fdd96853c9216bac4eda2c081821dbdaa2567d..f745d3198a3dc6cb4aed9d691da6017038cf0fae 100644 (file)
--- a/openpower/isa/fixedarith.mdwn
+++ b/openpower/isa/fixedarith.mdwn
@@ -239,6 +239,10 @@ Pseudo-code:
 
     RT <- ¬(RA) + (RB) + CA
 
+Description:
+
+       The sum ¬(RA) + (RB) + CA is placed into register RT.
+
 Special Registers Altered:
 
     CA CA32