Added English Language description for sthupx instruction

diff --git a/openpower/isa/pifixedstore.mdwn b/openpower/isa/pifixedstore.mdwn
index 5efd6b39d7eea0941c0ccd330acc610b0ae6740e..96e326821a82cad547da2e24cd9e1ae85d4e3298 100644 (file)
--- a/openpower/isa/pifixedstore.mdwn
+++ b/openpower/isa/pifixedstore.mdwn
@@ -95,7 +95,13 @@ Pseudo-code:
 
 Description:
 
+    Let the effective address (EA) be the sum (RA)+ (RB).
+    (RS)[56:63] are stored into the byte in storage addressed
+    by EA.
+
+    EA is placed into register RA.
 
+    If RA=0, the instruction form is invalid
 
 Special Registers Altered: