Add context to a json NEWS entry.
diff --git a/Misc/NEWS b/Misc/NEWS
index 77a6382..8ef6063 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -2710,8 +2710,8 @@
 - Issue #10182: The re module doesn't truncate indices to 32 bits anymore.
   Patch by Serhiy Storchaka.
 
-- Issue #16333: use (",", ": ") as default separator when indent is specified
-  to avoid trailing whitespace.  Patch by Serhiy Storchaka.
+- Issue #16333: use (",", ": ") as default separator in json when indent is
+  specified, to avoid trailing whitespace.  Patch by Serhiy Storchaka.
 
 - Issue #16573: In 2to3, treat enumerate() like a consuming call, so superfluous
   list() calls aren't added to filter(), map(), and zip() which are directly