diff --git a/src/tuned_models.jl b/src/tuned_models.jl
index 29713c2..514a279 100644
--- a/src/tuned_models.jl
+++ b/src/tuned_models.jl
@@ -3,7 +3,7 @@
 const ERR_SPECIFY_MODEL = ArgumentError(
 "You need to specify `model=...`, unless `tuning=Explicit()`. ")
 const ERR_SPECIFY_RANGE = ArgumentError(
-    "You need to specify `range=...`, unless `tuning=Explicit` and "*
+    "You need to specify `range=...`, unless `tuning=Explicit()` and "*
     "and `models=...` is specified instead. ")
 const ERR_SPECIFY_RANGE_OR_MODELS = ArgumentError(
     "No `model` specified. Either specify an explicit iterator "*
@@ -12,7 +12,7 @@ const ERR_SPECIFY_RANGE_OR_MODELS = ArgumentError(
 const ERR_NEED_EXPLICIT = ArgumentError(
     "You have specified an explicit "*
     "iterator `models` of MLJModels and so cannot "*
-    "specify any `tuning` strategy except `Explicit`. Either omit the "*
+    "specify any `tuning` strategy except `Explicit()`. Either omit the "*
     "`tuning=...` specification, or specify a *single* model using "*
     "`model=...` instead. ")
 const ERR_BOTH_DISALLOWED = ArgumentError(