diff --git a/src/filter.c b/src/filter.c
index ca837e6..7594cde 100644
--- a/src/filter.c
+++ b/src/filter.c
@@ -149,6 +149,14 @@ f2b_filter_destroy(f2b_filter_t *filter) {
   free(filter);
 }
 
+bool
+f2b_filter_append(f2b_filter_t *filter, const char *pattern) {
+  assert(filter  != NULL);
+  assert(pattern != NULL);
+
+  return filter->append(filter->cfg, pattern);
+}
+
 bool
 f2b_filter_match(f2b_filter_t *filter, const char *line, char *buf, size_t buf_size) {
   assert(filter != NULL);
diff --git a/src/filter.h b/src/filter.h
index 0c19959..01db0c5 100644
--- a/src/filter.h
+++ b/src/filter.h
@@ -26,6 +26,7 @@ typedef struct f2b_filter_t {
 f2b_filter_t * f2b_filter_create (f2b_config_section_t *config, const char *id);
 void           f2b_filter_destroy(f2b_filter_t *b);
 
+bool f2b_filter_append(f2b_filter_t *b, const char *pattern);
 bool f2b_filter_match(f2b_filter_t *b, const char *line, char *buf, size_t buf_size);
 const char * f2b_filter_error(f2b_filter_t *b);