diff --git a/BaselineOfDatanalitica.package/BaselineOfDatanalitica.class/instance/baseline..st b/BaselineOfDatanalitica.package/BaselineOfDatanalitica.class/instance/baseline..st
index 3e9c94c..446a040 100644
--- a/BaselineOfDatanalitica.package/BaselineOfDatanalitica.class/instance/baseline..st
+++ b/BaselineOfDatanalitica.package/BaselineOfDatanalitica.class/instance/baseline..st
@@ -2,7 +2,7 @@ baselines
 baseline: spec
 	<baseline>
 	spec
-		for: #comomn
+		for: #common
 		do: [ 
 			spec
 				package: 'Datanalitica'
diff --git a/Datanalitica.package/TwitterAPI.class/README.md b/Datanalitica.package/TwitterAPI.class/README.md
index e69de29..ddb9a25 100644
--- a/Datanalitica.package/TwitterAPI.class/README.md
+++ b/Datanalitica.package/TwitterAPI.class/README.md
@@ -0,0 +1,3 @@
+I model some parts of the Twitter API version 2 as described in:
+
+<https://developer.twitter.com/en/docs/twitter-api/early-access>
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterAPI.class/instance/storage..st b/Datanalitica.package/TwitterAPI.class/instance/storage..st
new file mode 100644
index 0000000..ee2dfd3
--- /dev/null
+++ b/Datanalitica.package/TwitterAPI.class/instance/storage..st
@@ -0,0 +1,4 @@
+accessing
+storage: aFolder
+
+	storage := aFolder
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterAPI.class/instance/storage.st b/Datanalitica.package/TwitterAPI.class/instance/storage.st
new file mode 100644
index 0000000..7275c54
--- /dev/null
+++ b/Datanalitica.package/TwitterAPI.class/instance/storage.st
@@ -0,0 +1,4 @@
+accessing
+storage
+
+	^ storage
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterAPI.class/instance/usersGroupMentioning..st b/Datanalitica.package/TwitterAPI.class/instance/usersGroupMentioning..st
index 36c294b..7372b37 100644
--- a/Datanalitica.package/TwitterAPI.class/instance/usersGroupMentioning..st
+++ b/Datanalitica.package/TwitterAPI.class/instance/usersGroupMentioning..st
@@ -5,4 +5,6 @@ usersGroupMentioning: userName
 	^ TwitterUsersGroup new
 		users: response messagesAuthors;
 		title: 'Users mentioning @', userName;
-		origin: response queryURL
\ No newline at end of file
+		origin: response queryURL;
+		date: DateAndTime now;
+		storage: self storage.
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterAPI.class/properties.json b/Datanalitica.package/TwitterAPI.class/properties.json
index 5798ddd..38e35df 100644
--- a/Datanalitica.package/TwitterAPI.class/properties.json
+++ b/Datanalitica.package/TwitterAPI.class/properties.json
@@ -1,5 +1,5 @@
 {
-	"commentStamp" : "",
+	"commentStamp" : "<historical>",
 	"super" : "Object",
 	"category" : "Datanalitica",
 	"classinstvars" : [ ],
@@ -7,7 +7,9 @@
 	"classvars" : [
 		"keys"
 	],
-	"instvars" : [ ],
+	"instvars" : [
+		"storage"
+	],
 	"name" : "TwitterAPI",
 	"type" : "normal"
 }
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterUsersGroup.class/instance/date..st b/Datanalitica.package/TwitterUsersGroup.class/instance/date..st
new file mode 100644
index 0000000..98aff15
--- /dev/null
+++ b/Datanalitica.package/TwitterUsersGroup.class/instance/date..st
@@ -0,0 +1,4 @@
+accessing
+date: aDateAndTime
+
+	date := aDateAndTime
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterUsersGroup.class/instance/date.st b/Datanalitica.package/TwitterUsersGroup.class/instance/date.st
new file mode 100644
index 0000000..7e72937
--- /dev/null
+++ b/Datanalitica.package/TwitterUsersGroup.class/instance/date.st
@@ -0,0 +1,4 @@
+accessing
+date
+
+	^ date
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterUsersGroup.class/instance/storage..st b/Datanalitica.package/TwitterUsersGroup.class/instance/storage..st
new file mode 100644
index 0000000..90f97ef
--- /dev/null
+++ b/Datanalitica.package/TwitterUsersGroup.class/instance/storage..st
@@ -0,0 +1,4 @@
+accessing
+storage: aFileReference
+
+	storage := aFileReference
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterUsersGroup.class/instance/storage.st b/Datanalitica.package/TwitterUsersGroup.class/instance/storage.st
new file mode 100644
index 0000000..7275c54
--- /dev/null
+++ b/Datanalitica.package/TwitterUsersGroup.class/instance/storage.st
@@ -0,0 +1,4 @@
+accessing
+storage
+
+	^ storage
\ No newline at end of file
diff --git a/Datanalitica.package/TwitterUsersGroup.class/properties.json b/Datanalitica.package/TwitterUsersGroup.class/properties.json
index fead877..dd1c265 100644
--- a/Datanalitica.package/TwitterUsersGroup.class/properties.json
+++ b/Datanalitica.package/TwitterUsersGroup.class/properties.json
@@ -9,7 +9,9 @@
 		"users",
 		"title",
 		"discourseTopics",
-		"origin"
+		"origin",
+		"date",
+		"storage"
 	],
 	"name" : "TwitterUsersGroup",
 	"type" : "normal"