1 files changed, 3 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
index 60e258c76a..6b2e5d21c4 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb
@@ -587,13 +587,14 @@ module ActiveRecord
         execute "ALTER TABLE #{name} RENAME TO #{new_name}"
       end
 
-      # Adds a column to a table.
+      # Adds a new column to the named table.
+      # See TableDefinition#column for details of the options you can use.
       def add_column(table_name, column_name, type, options = {})
         default = options[:default]
         notnull = options[:null] == false
 
         # Add the column.
-        execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit])}")
+        execute("ALTER TABLE #{quote_table_name(table_name)} ADD COLUMN #{quoted_column_name} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}")
 
         change_column_default(table_name, column_name, default) if options_include_default?(options)
         change_column_null(table_name, column_name, false, default) if notnull