diff --git a/pwiki/page.js b/pwiki/page.js
index 32b7683..613f2f8 100755
--- a/pwiki/page.js
+++ b/pwiki/page.js
@@ -548,7 +548,9 @@ object.Constructor('Page', BasePage, {
 			return source 
 				.replace(/test/g, 'TEST') },
 
-		// XXX
+		// XXX one way to do this in a stable manner is to wrap the source 
+		// 		in something like <span wikiwords=yes> .. </span> and only 
+		// 		process those removing the wrapper in dom...
 		wikiword: function(){}, 
 		'quote-wikiword': function(){},
 
diff --git a/pwiki/parser.js b/pwiki/parser.js
index ac90a13..1f015e3 100755
--- a/pwiki/parser.js
+++ b/pwiki/parser.js
@@ -480,15 +480,15 @@ module.BaseParser = {
 					: state.filters ?
 						that.normalizeFilters(state.filters)
 							.reduce(function(res, filter){
+								// unknown filter...
+								// NOTE: we try not to break on user errors
+								// 		if we can help it...
 								if(page.filters[filter] == null){
-									/* XXX
-									throw new Error(
-										'.parse(..): unsupported filter: '+ filter) }
-									/*/
 									console.warn(
 										'.parse(..): unsupported filter: '+ filter) 
 									return res }
-									//*/
+								// NOTE: if a filter returns falsy then it 
+								// 		will have no effect on the result...
 								return page.filters[filter].call(page, res) 
 									?? res }, section)
 					// no global filters...