Added English Language description for stfdu instruction

diff --git a/openpower/isa/fpstore.mdwn b/openpower/isa/fpstore.mdwn
index 71ea2114473d78fced2e86481a334cd3e348f189..a52ee68fffea29222dc0edf3b7e9d93cb779af36 100644 (file)
--- a/openpower/isa/fpstore.mdwn
+++ b/openpower/isa/fpstore.mdwn
@@ -160,6 +160,17 @@ Pseudo-code:
     MEM(EA, 8)<- (FRS) 
     RA <- EA
 
+Description:
+
+    Let the effective address (EA) be the sum (RA)+D.
+
+    The contents of register FRS are stored into the dou-
+    bleword in storage addressed by EA.
+
+    EA is placed into register RA.
+
+    If RA=0, the instruction form is invalid.
+
 Special Registers Altered:
 
     None