diff --git a/editions/tw5.com/tiddlers/filters/jsonstringify Operator.tid b/editions/tw5.com/tiddlers/filters/jsonstringify Operator.tid
index 9031b158f..d9fd288b7 100644
--- a/editions/tw5.com/tiddlers/filters/jsonstringify Operator.tid	
+++ b/editions/tw5.com/tiddlers/filters/jsonstringify Operator.tid	
@@ -15,10 +15,12 @@ The following substitutions are made:
 
 |!Character |!Replacement |
 |`\` |`\\` |
-|`"` |`\\` |
-|`'` |`\\` |
+|`"` |`\\"` |
 |`\r` (carriage return) |`\\r` |
 |`\n` (line feed) |`\\n` |
+|`\x08` (backpsace) |`\\b` |
+|`\x0c` (formfield) |`\\f` |
+|`\t` (tab) |`\\t` |
 |Characters from 0x00 to 0x1f |`\\x##` where ## is two hex digits |
 |Characters from 0x80 to 0xffff |`\\u####` where #### is four hex digits |