diff --git a/library/persistence/implementation/store/cms_storage_store_sql.e b/library/persistence/implementation/store/cms_storage_store_sql.e
index 09c1150..3a8a4c0 100644
--- a/library/persistence/implementation/store/cms_storage_store_sql.e
+++ b/library/persistence/implementation/store/cms_storage_store_sql.e
@@ -55,21 +55,25 @@ feature -- Query
 		end
 
 	sql_begin_transaction
+			-- <Precursor>
 		do
 			connection.begin_transaction
 		end
 
 	sql_rollback_transaction
+			-- <Precursor>
 		do
 			connection.rollback
 		end
 
 	sql_commit_transaction
+			-- <Precursor>
 		do
 			connection.commit
 		end
 
 	sql_query (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+			-- Execute an sql query `a_sql_statement' with the params `a_params'.
 		do
 			check_sql_query_validity (a_sql_statement, a_params)
 			db_handler.set_query (create {DATABASE_QUERY}.data_reader (a_sql_statement, a_params))
@@ -78,6 +82,7 @@ feature -- Query
 		end
 
 	sql_change (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+			-- Execute an sql query change `a_sql_statement' with the params `a_params'.
 		do
 			check_sql_query_validity (a_sql_statement, a_params)
 			db_handler.set_query (create {DATABASE_QUERY}.data_reader (a_sql_statement, a_params))
diff --git a/src/configuration/cms_setup.e b/src/configuration/cms_setup.e
index 014d620..a5cd6eb 100644
--- a/src/configuration/cms_setup.e
+++ b/src/configuration/cms_setup.e
@@ -106,7 +106,7 @@ feature -- Access: Theme
 feature -- Access: storage
 
 	storage_drivers: STRING_TABLE [CMS_STORAGE_BUILDER]
-			--
+			-- table of storage drivers that the cms is aware.
 		deferred
 		end
 
diff --git a/src/modules/node/node_module.e b/src/modules/node/node_module.e
index 35f6f6f..01c0be0 100644
--- a/src/modules/node/node_module.e
+++ b/src/modules/node/node_module.e
@@ -238,12 +238,14 @@ feature {NONE} -- Implementation: routes
 feature -- Hooks
 
 	register_hooks (a_response: CMS_RESPONSE)
+			-- <Precursor>
 		do
 			a_response.subscribe_to_menu_system_alter_hook (Current)
 			a_response.subscribe_to_block_hook (Current)
 		end
 
 	block_list: ITERABLE [like {CMS_BLOCK}.name]
+			-- <Precursor>
 		do
 			Result := <<"node-info">>
 		end
diff --git a/src/persistence/cms_storage_sql_i.e b/src/persistence/cms_storage_sql_i.e
index afae7f7..f3c5a22 100644
--- a/src/persistence/cms_storage_sql_i.e
+++ b/src/persistence/cms_storage_sql_i.e
@@ -35,14 +35,17 @@ feature -- Error handler
 feature -- Execution
 
 	sql_begin_transaction
+			-- Start a database transtaction.
 		deferred
 		end
 
 	sql_rollback_transaction
+			-- Rollback updates in the database.
 		deferred
 		end
 
 	sql_commit_transaction
+			-- Commit updates in the database.
 		deferred
 		end
 
@@ -107,10 +110,12 @@ feature -- Operation
 		end
 
 	sql_query (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+			-- <Precursor>
 		deferred
 		end
 
 	sql_change (a_sql_statement: STRING; a_params: detachable STRING_TABLE [detachable ANY])
+			-- <Precursor>
 		deferred
 		end