diff --git a/src/lib/icu/Converter.cxx b/src/lib/icu/Converter.cxx
index 7378f8636..1c6874065 100644
--- a/src/lib/icu/Converter.cxx
+++ b/src/lib/icu/Converter.cxx
@@ -51,6 +51,7 @@ IcuConverter::Create(const char *charset, Error &error)
 static std::string
 DoConvert(GIConv conv, const char *src)
 {
+	// TODO: dynamic buffer?
 	char buffer[4096];
 	char *in = const_cast<char *>(src);
 	char *out = buffer;