It turns out that I actually hadn't installed Advanced Help on this Drupal setup and was only using regular 'Help'
I'm using Views 7.x-3.5 (API version 3) and Drupal 7.17
I installed Advanced Help (some time ago now) and cleared all caches
When I go to /admin/help I see a list of the following...
Help topics
Help is available on the following items:
Administration menu
Advanced User Management
Block
CKEditor
Color
Comment
Content Access
Contextual links
Dashboard
Database logging
Date
Field
Field SQL storage
Field UI
File
Filter
Help
Image
List
Menu
Menu Block
Node
Number
Options
Path
Pathauto
RDF
Rules
Rules Forms Support
Search
System
Taxonomy
Text
ThemeKey
Token
Trigger
User
Webform
The following is constantly displayed in structure > views
If you install the advanced help module from http://drupal.org/project/advanced_help, Views will provide more and better help. Hide this message.