diff --git a/content/pages/docs/zoo-design-studio/features/workspace/code-editor.mdx b/content/pages/docs/zoo-design-studio/features/workspace/code-editor.mdx
index 5745ffb4..045ad83e 100644
--- a/content/pages/docs/zoo-design-studio/features/workspace/code-editor.mdx
+++ b/content/pages/docs/zoo-design-studio/features/workspace/code-editor.mdx
@@ -1,10 +1,12 @@
 ---
 title: Code Editor
-excerpt: Edit KCL directly inside Zoo Design Studio.
+excerpt: Edit KCL and project text files directly inside Zoo Design Studio.
 sidebarPosition: 5
 ---
 
 The Code Editor is the KCL source panel for the active model.
+It also opens project text files selected in the
+[File Explorer](/docs/zoo-design-studio/features/workspace/file-explorer#open-text-files).
 
 ## What You Can Do
 
@@ -12,6 +14,8 @@ The Code Editor is the KCL source panel for the active model.
 - Format code, copy code, and open KCL docs from the pane menu.
 - Use diagnostics, lint markers, and syntax-aware editor behavior.
 - Use undo and redo within the app's editing workflow.
+- Edit UTF-8 project text files up to 1 MiB with automatic saving. Markdown files have syntax
+  highlighting; other non-KCL text files use plain text editing.
 
 ## What You Cannot Do
 
diff --git a/content/pages/docs/zoo-design-studio/features/workspace/file-explorer.mdx b/content/pages/docs/zoo-design-studio/features/workspace/file-explorer.mdx
index f88fb1d1..aed121a1 100644
--- a/content/pages/docs/zoo-design-studio/features/workspace/file-explorer.mdx
+++ b/content/pages/docs/zoo-design-studio/features/workspace/file-explorer.mdx
@@ -22,8 +22,19 @@ The File Explorer shows the files and folders inside the current project.
 - Archive entries you no longer need.
 - [Add files from your computer](/docs/zoo-design-studio/features/data-management/import#add-file-to-project) by dragging them into Project Files in the browser or desktop app.
 - Open `.kcl` files directly for editing.
+- Open UTF-8 text files, including JSON, YAML, TOML, source files, and files without an extension.
 - Reveal the project, or an individual file or folder, in the system file manager on desktop.
 
+## Open Text Files
+
+Click a text file in Project Files to open it in the Code Editor. Edits save automatically.
+Text files can be up to 1 MiB. Binary files and files in other text encodings cannot be edited.
+Enable **Show All Files** in user settings to see hidden files and configuration files such as
+`project.toml`.
+
+Text-based CAD files such as STEP or OBJ also open with a click. To import a CAD file into the
+model, right-click it and choose **Import in current file**.
+
 ## Reveal in the System File Manager
 
 Use `Reveal in file explorer` when you need to work with a project in Finder, File Explorer, or your