diff --git a/skills/minio-upload/SKILL.md b/skills/minio-upload/SKILL.md
index 4b15d94..aa11b37 100644
--- a/skills/minio-upload/SKILL.md
+++ b/skills/minio-upload/SKILL.md
@@ -19,6 +19,28 @@ Upload to a custom subpath:
 .claude/skills/minio-upload/scripts/upload_to_obsidian.sh path/to/file.md "notes/2024"
 ```
 
+## Path Configuration
+
+**CRITICAL RULE**: When no path is explicitly specified by the user, files MUST be uploaded to the `main` path only. Do NOT assume or invent custom subpaths.
+
+### Path Behavior
+
+- **No path specified**: Upload to `minio/obsidian/main/` (DEFAULT - use this unless user explicitly requests otherwise)
+- **Custom path specified**: Use the exact path provided by the user (e.g., `notes/2024`, `archive/old projects`)
+- **Nested paths**: Multi-level paths are supported when explicitly requested (e.g., `notes/personal/journal`)
+
+### Important Constraints
+
+1. **Never assume paths**: If the user doesn't specify a path, always use `main`
+2. **User intent only**: Only use custom subpaths when the user explicitly provides them
+3. **Path validation**: The script automatically normalizes paths and appends the filename
+
+### Examples
+
+- User says "upload file.md" → Upload to `main/`
+- User says "upload to notes" → Upload to `notes/`
+- User says "upload to archive/old projects" → Upload to `archive/old projects/`
+
 ## Workflow
 
 1. **Verify file exists** - Check that the source file is accessible
@@ -26,19 +48,6 @@ Upload to a custom subpath:
 3. **Upload with mc** - Execute `mc cp` command to transfer file
 4. **Confirm success** - Verify upload completed and report target location
 
-## Path Configuration
-
-The script accepts an optional subpath argument:
-
-- **Default**: Files upload to `minio/obsidian/main/`
-- **Custom subpath**: Specify any subpath (e.g., `notes/2024`, `archive/old projects`)
-- **Nested paths**: Multi-level paths are supported (e.g., `notes/personal/journal`)
-
-The script automatically:
-- Appends the filename to the target path
-- Normalizes multiple slashes in paths
-- Uses the `minio` alias configured in mc
-
 ## Error Handling
 
 The script will: