diff --git a/include/qertypes.h b/include/qertypes.h
index e63f9c2f..941d34bb 100644
--- a/include/qertypes.h
+++ b/include/qertypes.h
@@ -724,6 +724,7 @@ struct bfilter_t //c++ style
 	                        // 4=brush->owner->eclass->nShowFlags
 	                        // 5=brush->face->texdef.flags (q2)
 	                        // 6=brush->face->texdef.contents (q2)
+	                        // 7=!brush->face->texdef.contents (q2)
 	int mask;
 	const char  *string;
 	bool active;
@@ -735,7 +736,7 @@ struct bfilter_t //c++ style
 typedef struct
 {
 	int iTexMenu;           // nearest, linear, etc
-	float fGamma;         // gamma for textures
+	float fGamma;           // gamma for textures
 	vec3_t colors[COLOR_LAST];
 	int exclude;
 	int include;
diff --git a/radiant/filters.cpp b/radiant/filters.cpp
index f9669cff..e9b1b1ad 100644
--- a/radiant/filters.cpp
+++ b/radiant/filters.cpp
@@ -201,7 +201,7 @@ bool FilterBrush( brush_t *pb ){
 
 
 	if ( g_qeglobals.d_savedinfo.exclude & EXCLUDE_DETAILS ) {
-		if ( !pb->patchBrush && pb->brush_faces->texdef.contents & CONTENTS_DETAIL ) {
+		if ( !pb->patchBrush && ( pb->brush_faces->texdef.contents & CONTENTS_DETAIL ) ) {
 			return TRUE;
 		}
 	}
@@ -239,16 +239,16 @@ bool FilterBrush( brush_t *pb ){
 						filterbrush = true;
 						break;
 					}
-					// quake2 - 5 == surface flags, 6 == content flags
 				}
+				// quake2 - 5 == surface flags, 6 == content flags, 7 == !content flags
 				else if ( filters->attribute == 5 ) {
-					if ( f->texdef.flags && f->texdef.flags & filters->mask ) {
+					if ( f->texdef.flags && ( f->texdef.flags & filters->mask ) ) {
 						filterbrush = true;
 						break;
 					}
 				}
 				else if ( filters->attribute == 6 ) {
-					if ( f->texdef.contents && f->texdef.contents & filters->mask ) {
+					if ( f->texdef.contents && ( f->texdef.contents & filters->mask ) ) {
 						filterbrush = true;
 						break;
 					}