diff --git a/editions/tw5.com/tiddlers/filters/Filter Operators.tid b/editions/tw5.com/tiddlers/filters/Filter Operators.tid
index b47a08314..b7818316d 100644
--- a/editions/tw5.com/tiddlers/filters/Filter Operators.tid	
+++ b/editions/tw5.com/tiddlers/filters/Filter Operators.tid	
@@ -7,24 +7,28 @@ type: text/vnd.tiddlywiki
 \define .operator-rows(filter)
 <$list filter="$filter$"><tr>
 <td><$link to={{!!title}}>{{!!caption}}</$link></td>
-<td>{{!!op-purpose}} <$list filter="[all[current]tag[Common Operators]]">{{$:/core/images/done-button}}</$list></td>
+<td>{{!!op-purpose}}</td>
+<td align="center"><$list filter="[all[current]tag[Common Operators]]">✓</$list></td>
 <td align="center"><$list filter="[all[current]tag[Negatable Operators]]">`!`</$list></td>
 </tr></$list>
 \end
 
 \define .group-heading(_)
-<tr class="doc-table-subheading"><th colspan="3" align="center">$_$</th></tr>
+<tr class="doc-table-subheading"><th colspan="4" align="center">$_$</th></tr>
 \end
 
 A <<.def "filter operator">> is a predefined keyword attached to an individual [[step|Filter Step]] of a [[filter|Filters]]. It defines the particular action of that step.
 
-The following table lists all the core operators. The commonest ones are checkmarked. The third column indicates which operators allow <$link to="Filter Step">the <code>!</code> prefix</$link> to reverse their meaning.
+''Important:'' Each first [[step|Filter Step]] of a [[filter run|Filter Run]] not given any input titles receives the output of <$link to="all Operator">[all[tiddlers]]</$link> as its input.
+
+The following table lists all core operators, the most common ones marked ✓. The last column indicates whether an operator allows ''negation'' using the <$link to="Filter Step"><code>!</code> prefix</$link>. For specifics as to each operator's negated output please refer to its documentation.
 
 <table>
 <tr>
 <th align="left">Operator</th>
 <th align="left">Purpose</th>
-<th align="left">Neg</th>
+<th align="center">✓</th>
+<th align="center">`!`</th>
 </tr>
 <<.operator-rows "[tag[Filter Operators]!tag[Order Operators]!tag[String Operators]!tag[Tag Operators]!tag[Special Operators]sort[]]">>
 <<.group-heading "Order Operators">>
@@ -41,4 +45,4 @@ The following table lists all the core operators. The commonest ones are checkma
 
 A typical step is written as `[operator[parameter]]`, although not all of the operators need a [[parameter|Filter Parameter]].
 
-Most steps process the [[selection of titles|Title Selection]] that are supplied as their input, but a few [[construct an entirely new selection|Selection Constructors]] instead. For the exact rules, see [[Filter Syntax]].
+Most steps process the [[selection of titles|Title Selection]] that are supplied as their input, but a few [[construct an entirely new selection|Selection Constructors]] instead. For the exact rules, see [[Filter Syntax]].
\ No newline at end of file