--- a/src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java	Thu Feb 22 11:52:01 2018 +0530
+++ b/src/java.base/share/classes/java/lang/invoke/StringConcatFactory.java	Thu Feb 22 11:16:43 2018 +0100
@@ -373,6 +373,12 @@
         }
     }
 
+    // StringConcatFactory bootstrap methods are startup sensitive, and may be
+    // special cased in java.lang.invokeBootstrapMethodInvoker to ensure
+    // methods are invoked with exact type information to avoid generating
+    // code for runtime checks. Take care any changes or additions here are
+    // reflected there as appropriate.
+
     /**
      * Facilitates the creation of optimized String concatenation methods, that
      * can be used to efficiently concatenate a known number of arguments of