diff --git a/terminal.h b/terminal.h
index 62c7e707..d9261bab 100644
--- a/terminal.h
+++ b/terminal.h
@@ -80,7 +80,7 @@ struct damage {
 #if FOOT_UNICODE_COMBINING
 struct combining_chars {
     uint8_t count;
-    wchar_t chars[2];  /* TODO: how many do we need? */
+    wchar_t chars[2];  /* This is XTerms default, but there _are_ cases where more are needed */
 };
 #endif