diff --git a/include/llvm/Target/TargetAsmInfo.h b/include/llvm/Target/TargetAsmInfo.h
index a8a3529b767..9b5ba4819cb 100644
--- a/include/llvm/Target/TargetAsmInfo.h
+++ b/include/llvm/Target/TargetAsmInfo.h
@@ -147,8 +147,10 @@ namespace llvm {
     /// AssemblerDialect - Which dialect of an assembler variant to use.
     unsigned AssemblerDialect;            // Defaults to 0
 
-    /// StringConstantPrefix - Prefix to use when generating unnamed
-    /// constant strings.  These names get run through the Mangler later.
+    /// StringConstantPrefix - Prefix for FEs to use when generating unnamed
+    /// constant strings.  These names get run through the Mangler later; if
+    /// you want the Mangler not to add the GlobalPrefix as well, 
+    /// use '\1' as the first character.
     const char *StringConstantPrefix;     // Defaults to ".str"
 
     //===--- Data Emission Directives -------------------------------------===//