diff --git a/modules/blog/cms_node_storage_sql_blog_extension.e b/modules/blog/cms_node_storage_sql_blog_extension.e
index 1b1d5dd..e2272b8 100644
--- a/modules/blog/cms_node_storage_sql_blog_extension.e
+++ b/modules/blog/cms_node_storage_sql_blog_extension.e
@@ -41,6 +41,7 @@ feature -- Access
 feature -- Persistence
 
 	store (a_node: CMS_BLOG)
+			-- <Precursor>.
 		local
 			l_parameters: STRING_TABLE [detachable ANY]
 			l_new_tags: detachable STRING_32
@@ -97,6 +98,7 @@ feature -- Persistence
 		end
 
 	load (a_node: CMS_BLOG)
+			-- <Precursor>.
 		local
 			l_tags: READABLE_STRING_32
 		do
@@ -106,7 +108,10 @@ feature -- Persistence
 			end
 		end
 
+feature {NONE} -- Implementation		
+
 	node_data (a_node: CMS_NODE): detachable TUPLE [revision: INTEGER_64; tags: READABLE_STRING_32]
+			-- Node extension data for node `a_node' as tuple.
 		local
 			l_parameters: STRING_TABLE [ANY]
 			l_rev: INTEGER_64
diff --git a/modules/node/cms_node_api.e b/modules/node/cms_node_api.e
index a5c8ad4..3ee8c61 100644
--- a/modules/node/cms_node_api.e
+++ b/modules/node/cms_node_api.e
@@ -222,6 +222,7 @@ feature -- Access: Node
 		end
 
 	node_revisions (a_node: CMS_NODE): LIST [CMS_NODE]
+			-- List of revisions for node `a_node'.
 		do
 			Result := node_storage.node_revisions (a_node)
 			Result := full_nodes (Result)
diff --git a/modules/node/persistence/cms_node_storage_extension.e b/modules/node/persistence/cms_node_storage_extension.e
index 1ea4f40..5c73cac 100644
--- a/modules/node/persistence/cms_node_storage_extension.e
+++ b/modules/node/persistence/cms_node_storage_extension.e
@@ -52,10 +52,12 @@ feature -- Persistence
 feature {NONE} -- Persistence implementation
 
 	store (a_node: G)
+			-- Store extension data from node `a_node'.
 		deferred
 		end
 
 	load (a_node: G)
+			-- Load extension data into node `a_node'.	
 		deferred
 		end
 
diff --git a/modules/node/persistence/cms_node_storage_sql_page_extension.e b/modules/node/persistence/cms_node_storage_sql_page_extension.e
index 9d64d50..d28091b 100644
--- a/modules/node/persistence/cms_node_storage_sql_page_extension.e
+++ b/modules/node/persistence/cms_node_storage_sql_page_extension.e
@@ -41,6 +41,7 @@ feature -- Access
 feature -- Persistence
 
 	store (a_node: CMS_PAGE)
+			-- <Precursor>.	
 		local
 			l_parameters: STRING_TABLE [ANY]
 			l_new_parent_id, l_previous_parent_id: INTEGER_64
@@ -87,6 +88,7 @@ feature -- Persistence
 		end
 
 	load (a_node: CMS_PAGE)
+			-- <Precursor>.
 		local
 			ct: CMS_PAGE_NODE_TYPE
 			l_parent_id: INTEGER_64
@@ -110,7 +112,10 @@ feature -- Persistence
 			end
 		end
 
+feature {NONE} -- Implementation
+
 	node_data (a_node: CMS_NODE): detachable TUPLE [parent_id: INTEGER_64]
+			-- Node extension data for node `a_node' as tuple.
 		local
 			l_parameters: STRING_TABLE [ANY]
 			n: INTEGER