Update README.md

diff --git a/README.md b/README.md
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+++ b/README.md
@@ -33,7 +33,7 @@ How does HTMLMinifier compare to [another solution](http://www.willpeavy.com/min
 | `removeCommentsFromCDATA`      | [Strip HTML comments from scripts and styles](http://perfectionkills.com/experimenting-with-html-minifier/#remove_comments_from_scripts_and_styles) | `false` |
 | `removeCDATASectionsFromCDATA` | [Remove CDATA sections from script and style elements](http://perfectionkills.com/experimenting-with-html-minifier/#remove_cdata_sections) | `false` |
 | `collapseWhitespace`           | [Collapse white space that contributes to text nodes in a document tree.](http://perfectionkills.com/experimenting-with-html-minifier/#collapse_whitespace) | `false` |
-| `conservativeCollapse`         | Always collapse to 1 space (never remove it entirely) | `false` |
+| `conservativeCollapse`         | Always collapse to 1 space (never remove it entirely). Must be used in conjunction with `collapseWhitespace=true` | `false` |
 | `collapseBooleanAttributes`    | [Omit attribute values from boolean attributes](http://perfectionkills.com/experimenting-with-html-minifier/#collapse_boolean_attributes) | `false` |
 | `removeAttributeQuotes`        | [Remove quotes around attributes when possible.](http://perfectionkills.com/experimenting-with-html-minifier/#remove_attribute_quotes) | `false` |
 | `removeRedundantAttributes`    | [Remove attributes when value matches default.](http://perfectionkills.com/experimenting-with-html-minifier/#remove_redundant_attributes) | `false` |