diff --git a/app/models/creature.rb b/app/models/creature.rb
index 70eecdf..3563796 100644
--- a/app/models/creature.rb
+++ b/app/models/creature.rb
@@ -3,6 +3,9 @@ class Creature < ApplicationRecord
 
   enum :size, [:small, :big, :giant]
 
+  validates :name, presence: true
+  validates :health_points, numericality: { greater_than_or_equal_to: 0 }
+
   def alive?
     self.health_points > 0
   end