diff --git a/include/clap/ext/draft/undo.h b/include/clap/ext/draft/undo.h
index c84e9608..68fe2a3b 100644
--- a/include/clap/ext/draft/undo.h
+++ b/include/clap/ext/draft/undo.h
@@ -108,7 +108,7 @@ typedef struct clap_plugin_undo_context {
 
    // Sets the name of the next undo or redo step.
    // name: null terminated string.
-   // [main-thread]
+   // [main-thread & plugin-subscribed-to-undo-context]
    void(CLAP_ABI *set_undo_name)(const clap_plugin_t *plugin, const char *name);
    void(CLAP_ABI *set_redo_name)(const clap_plugin_t *plugin, const char *name);
 } clap_plugin_undo_context_t;