diff --git a/src/browser/main.coffee b/src/browser/main.coffee
index 5e5c87155..c97e62130 100644
--- a/src/browser/main.coffee
+++ b/src/browser/main.coffee
@@ -109,11 +109,11 @@ parseCommandLine = ->
   options.boolean('profile-startup').describe('profile-startup', 'Create a profile of the startup execution time.')
   options.alias('r', 'resource-path').string('r').describe('r', 'Set the path to the Atom source directory and enable dev-mode.')
   options.boolean('safe').describe('safe', 'Do not load packages from ~/.atom/packages or ~/.atom/dev/packages.')
+  options.boolean('set-portable').describe('set-portable', 'Set portable mode. Copies the ~/.atom folder to be a sibling of the installed Atom location.')
   options.alias('t', 'test').boolean('t').describe('t', 'Run the specified specs and exit with error code on failures.')
   options.string('timeout').describe('timeout', 'When in test mode, waits until the specified time (in minutes) and kills the process (exit code: 130).')
   options.alias('v', 'version').boolean('v').describe('v', 'Print the version.')
   options.alias('w', 'wait').boolean('w').describe('w', 'Wait for window to be closed before returning.')
-  options.alias('p', 'set-portable').boolean('p').describe('p', 'Set portable mode.')
   options.string('socket-path')
 
   args = options.argv