1 file changed, 7 insertions, 0 deletions
diff --git a/source/html.h b/source/html.h
index 4c16f85..1accb37 100644
--- a/source/html.h
+++ b/source/html.h
@@ -93,6 +93,13 @@ extern void html_attr_url(const char *txt);
 
 extern void html_url_arg(const char *txt);
 extern void html_header_arg_in_quotes(const char *txt);
+
+/*
+ * Percent-encode txt as the value of an RFC 8187 header parameter such as
+ * filename*, leaving out the charset and language the value opens with.
+ */
+extern void html_header_ext_value(const char *txt);
+
 extern void html_header_query(const char *txt);
 extern void html_hidden(const char *name, const char *value);