diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index ef19538447..044272ea51 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -205,8 +205,6 @@ module ActiveRecord
       # In order to get around this problem, #transaction will emulate the effect
       # of nested transactions, by using savepoints:
       # https://dev.mysql.com/doc/refman/5.7/en/savepoint.html
-      # Savepoints are supported by MySQL and PostgreSQL. SQLite3 version >= '3.6.8'
-      # supports savepoints.
       #
       # It is safe to call this method if a database transaction is already open,
       # i.e. if #transaction is called within another #transaction block. In case
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
index 2b64e96450..f97842b3f5 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/schema_statements.rb
@@ -735,7 +735,7 @@ module ActiveRecord
       #
       #   CREATE UNIQUE INDEX index_accounts_on_branch_id_and_party_id ON accounts(branch_id, party_id) WHERE active
       #
-      # Note: Partial indexes are only supported for PostgreSQL and SQLite 3.8.0+.
+      # Note: Partial indexes are only supported for PostgreSQL and SQLite.
       #
       # ====== Creating an index with a specific method
       #
diff --git a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
index f5f5827d04..41b35d9fc6 100644
--- a/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/sqlite3_adapter.rb
@@ -48,8 +48,8 @@ module ActiveRecord
   end
 
   module ConnectionAdapters #:nodoc:
-    # The SQLite3 adapter works SQLite 3.6.16 or newer
-    # with the sqlite3-ruby drivers (available as gem from https://rubygems.org/gems/sqlite3).
+    # The SQLite3 adapter works with the sqlite3-ruby drivers
+    # (available as gem from https://rubygems.org/gems/sqlite3).
     #
     # Options:
     #
diff --git a/activerecord/lib/active_record/transactions.rb b/activerecord/lib/active_record/transactions.rb
index 148bc0550c..cbb970ac98 100644
--- a/activerecord/lib/active_record/transactions.rb
+++ b/activerecord/lib/active_record/transactions.rb
@@ -164,12 +164,12 @@ module ActiveRecord
     #     end
     #   end
     #
-    # only "Kotori" is created. This works on MySQL and PostgreSQL. SQLite3 version >= '3.6.8' also supports it.
+    # only "Kotori" is created.
     #
     # Most databases don't support true nested transactions. At the time of
     # writing, the only database that we're aware of that supports true nested
     # transactions, is MS-SQL. Because of this, Active Record emulates nested
-    # transactions by using savepoints on MySQL and PostgreSQL. See
+    # transactions by using savepoints. See
     # https://dev.mysql.com/doc/refman/5.7/en/savepoint.html
     # for more information about savepoints.
     #