diff --git a/src/backend/port/tas/solaris_x86_64.s b/src/backend/port/tas/solaris_x86_64.s
index 4fad43e5a2a88000bce2a0c486426933cbf03ea1..5c33caa4d41668f853294aea05e0476bd88f3509 100644
--- a/src/backend/port/tas/solaris_x86_64.s
+++ b/src/backend/port/tas/solaris_x86_64.s
@@ -1,7 +1,8 @@
 /=============================================================================
 / tas.s -- test and set lock for solaris_i386
 / based on i386 ASM with modifications outlined in
-/ http://www.x86-64.org/documentation/assembly
+/ http://www.x86-64.org/documentation/assembly.
+/ This might require flags:  -Xa -xtarget=opteron -xarch=amd64
 /=============================================================================
 
         .file   "tas.s"