diff --git a/activerecord/lib/active_record/connection_handling.rb b/activerecord/lib/active_record/connection_handling.rb
index 984af79642..24f5849e45 100644
--- a/activerecord/lib/active_record/connection_handling.rb
+++ b/activerecord/lib/active_record/connection_handling.rb
@@ -5,7 +5,7 @@ module ActiveRecord
 
     # Establishes the connection to the database. Accepts a hash as input where
     # the <tt>:adapter</tt> key must be specified with the name of a database adapter (in lower-case)
-    # example for regular databases (MySQL, Postgresql, etc):
+    # example for regular databases (MySQL, PostgreSQL, etc):
     #
     #   ActiveRecord::Base.establish_connection(
     #     adapter:  "mysql",
diff --git a/activerecord/lib/active_record/relation/calculations.rb b/activerecord/lib/active_record/relation/calculations.rb
index 4a4de86d48..7f27e7b463 100644
--- a/activerecord/lib/active_record/relation/calculations.rb
+++ b/activerecord/lib/active_record/relation/calculations.rb
@@ -222,7 +222,7 @@ module ActiveRecord
     end
 
     def execute_simple_calculation(operation, column_name, distinct) #:nodoc:
-      # Postgresql doesn't like ORDER BY when there are no GROUP BY
+      # PostgreSQL doesn't like ORDER BY when there are no GROUP BY
       relation = unscope(:order)
 
       column_alias = column_name