diff --git a/.obsidian/app.json b/.obsidian/app.json
index ba7ab63..ba8a803 100644
--- a/.obsidian/app.json
+++ b/.obsidian/app.json
@@ -9,7 +9,7 @@
   "foldHeading": true,
   "alwaysUpdateLinks": true,
   "showUnsupportedFiles": true,
-  "attachmentFolderPath": "files",
+  "attachmentFolderPath": "_files",
   "defaultViewMode": "preview",
   "fileSortOrder": "byCreatedTime",
   "showFrontmatter": true,
diff --git a/OJ notes/pages/Leetcode Populating-Next-Right-Pointers-In-Each-Node.md b/OJ notes/pages/Leetcode Populating-Next-Right-Pointers-In-Each-Node.md
index a287c01..0519857 100644
--- a/OJ notes/pages/Leetcode Populating-Next-Right-Pointers-In-Each-Node.md	
+++ b/OJ notes/pages/Leetcode Populating-Next-Right-Pointers-In-Each-Node.md	
@@ -71,7 +71,10 @@ simple BFS, for each level, connect the node to the next.
 
 Remember to get the for loop right.
 
-#####
+##### BFS-like iteration, two pointers
+
+We utilize the ->next property to link ptr->left->right->next to ptr->right->left
+
 
 ##### Also can be done with DFS
 
diff --git a/_files/Screenshot_2022-07-16-10-07-16-238_com.microsoft.office.onenote.png b/_files/Screenshot_2022-07-16-10-07-16-238_com.microsoft.office.onenote.png
new file mode 100644
index 0000000..fb35f16
Binary files /dev/null and b/_files/Screenshot_2022-07-16-10-07-16-238_com.microsoft.office.onenote.png differ
diff --git a/_files/Screenshot_2022-07-16-10-09-30-062_com.microsoft.office.onenote.png b/_files/Screenshot_2022-07-16-10-09-30-062_com.microsoft.office.onenote.png
new file mode 100644
index 0000000..c0f86c2
Binary files /dev/null and b/_files/Screenshot_2022-07-16-10-09-30-062_com.microsoft.office.onenote.png differ