diff --git a/app/models/submission.rb b/app/models/submission.rb
--- a/app/models/submission.rb
+++ b/app/models/submission.rb
@@ -8,7 +8,7 @@
   before_validation :assign_language
 
   validates_presence_of :source
-  validates_length_of :source, :maximum => 100_000, :allow_blank => true, :message => 'too long'
+  validates_length_of :source, :maximum => 100_000, :allow_blank => true, :message => 'code too long, the limit is 100,000 bytes'
   validates_length_of :source, :minimum => 1, :allow_blank => true, :message => 'too short'
   validate :must_have_valid_problem
   validate :must_specify_language
diff --git a/db/migrate/20180612102327_change_submission_source_size.rb b/db/migrate/20180612102327_change_submission_source_size.rb
new file mode 100644
--- /dev/null
+++ b/db/migrate/20180612102327_change_submission_source_size.rb
@@ -0,0 +1,5 @@
+class ChangeSubmissionSourceSize < ActiveRecord::Migration
+  def change
+    change_column :submissions, :source, :text, :limit => 1.megabyte
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170914150742) do
+ActiveRecord::Schema.define(version: 20180612102327) do
 
   create_table "announcements", force: :cascade do |t|
     t.string   "author",       limit: 255