diff --git a/Tutorial_Docs/Associations.MD b/Tutorial_Docs/Associations.MD
new file mode 100644
index 0000000..c0d3405
--- /dev/null
+++ b/Tutorial_Docs/Associations.MD
@@ -0,0 +1,14 @@
+# ActiveRecord Associations
+
+## One-to-one
+* has_one
+* belongs_to
+
+## One-to-many
+* has_many
+* belongs_to
+
+## Many to Many
+(When join table only has foreign keys)
+* has_and_belongs_to_many (HABTM method)
+* has_and_belongs_to_many
diff --git a/app/models/page.rb b/app/models/page.rb
index ee51575..176ee1d 100644
--- a/app/models/page.rb
+++ b/app/models/page.rb
@@ -1,2 +1,5 @@
 class Page < ApplicationRecord
+
+  belongs_to :subject
+
 end
diff --git a/app/models/subject.rb b/app/models/subject.rb
index 6b29eef..4a7f26b 100644
--- a/app/models/subject.rb
+++ b/app/models/subject.rb
@@ -1,5 +1,8 @@
 class Subject < ApplicationRecord
 
+  # Relations
+  has_one :page # Doesn't actually have 1, but showing for demonstration purposes
+
   # Lamda is read at execution time, which is important for dates.
   scope :visible, lambda { where(:visible => true) }
   # Stabby lambda syntax is subtly different, but can also be used.