1 files changed, 3 insertions, 0 deletions
diff --git a/lib/options.nix b/lib/options.nix
index 480837fd1cf..d649d1160a0 100644
--- a/lib/options.nix
+++ b/lib/options.nix
@@ -66,6 +66,9 @@ rec {
          then head list
     else throw "Cannot merge values.";
 
+
+  /* Obsolete, will remove soon.  Specify an option type or apply
+     function instead.  */
   mergeTypedOption = typeName: predicate: merge: list:
     if all predicate list then merge list
     else throw "Expect a ${typeName}.";