diff --git a/docs/README.md b/docs/README.md
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--- a/docs/README.md
+++ b/docs/README.md
@@ -7,6 +7,7 @@
 ## API references
 
 * [Synopsis](api/synopsis.md)
+* [Process object](api/process.md)
 
 Modules for browser side:
 
diff --git a/docs/api/process.md b/docs/api/process.md
new file mode 100644
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+++ b/docs/api/process.md
@@ -0,0 +1,8 @@
+# Process object
+
+The `process` object in atom-shell has following differences between the one in
+upstream node:
+
+* `process.type` String - Process's type, can be `browser` or `renderer`.
+* `process.versions['atom-shell']` String - Version of atom-shell.
+* `process.resourcesPath` String - Path to JavaScript source codes.