diff --git a/.obsidian/workspace b/.obsidian/workspace
index 06e461936..0786653c0 100644
--- a/.obsidian/workspace
+++ b/.obsidian/workspace
@@ -39,7 +39,7 @@
                 "state": {
                   "type": "markdown",
                   "state": {
-                    "file": "x spreadsheet.md",
+                    "file": "flutter.md",
                     "mode": "source"
                   }
                 }
@@ -152,7 +152,7 @@
             "state": {
               "type": "backlink",
               "state": {
-                "file": "x spreadsheet.md",
+                "file": "2021-05-12.md",
                 "collapseAll": false,
                 "extraContext": false,
                 "sortOrder": "alphabetical",
@@ -169,7 +169,7 @@
             "state": {
               "type": "outline",
               "state": {
-                "file": "x spreadsheet.md"
+                "file": "2021-05-12.md"
               }
             }
           }
@@ -180,17 +180,17 @@
     "width": 300,
     "collapsed": true
   },
-  "active": "efbe1ae9bb8e1c40",
+  "active": "f28c6a220ac18edd",
   "lastOpenFiles": [
-    "x spreadsheet.md",
     "2021-05-12.md",
+    "flutter.md",
+    "x spreadsheet.md",
     "radijo musikii.md",
     "the secret of monkey island.md",
     "radiko musijik.md",
     "2021-05-10.md",
     "monkey island.md",
     "2021-05-08.md",
-    "2021-05-07.md",
-    "flancia collective.md"
+    "2021-05-07.md"
   ]
 }
\ No newline at end of file
diff --git a/2021-05-12.md b/2021-05-12.md
index 8767f9d7c..4bb2f8535 100644
--- a/2021-05-12.md
+++ b/2021-05-12.md
@@ -1 +1,3 @@
-- [[x spreadsheet]]
\ No newline at end of file
+- [[x spreadsheet]]
+- [[flutter]]
+- [[visualizing sep]]
\ No newline at end of file
diff --git a/flutter.md b/flutter.md
new file mode 100644
index 000000000..df4fcc8cb
--- /dev/null
+++ b/flutter.md
@@ -0,0 +1 @@
+- based on [[dart]]
\ No newline at end of file
diff --git a/x spreadsheet.md b/x spreadsheet.md
index f5bb0e8db..f815d07c5 100644
--- a/x spreadsheet.md	
+++ b/x spreadsheet.md	
@@ -1 +1,4 @@
-- a [[]]
\ No newline at end of file
+- a [[spreadsheet]]
+	- in [[javascript]]
+	- [[open source]
+	- [[go]] https://github.com/myliang/x-spreadsheet
\ No newline at end of file