diff --git a/tools/README.md b/tools/README.md
index 5d810ee2..b24a8f50 100644
--- a/tools/README.md
+++ b/tools/README.md
@@ -58,7 +58,7 @@ Templated functions should be annotated with `TEMPLATE`. Since the goal is to ev
 
 ### `SYNTHETIC`
 
-Synthetic functions should be annotated with `SYNTHETIC`. A synthetic function is generated by the compiler; for the time being, the only case is the "scalar deleting destructor" found in virtual tables. Note: `SYNTHETIC` takes precedence over `TEMPLATE`.
+Synthetic functions should be annotated with `SYNTHETIC`. A synthetic function is generated by the compiler; most common is the "scalar deleting destructor" found in virtual tables. Other cases include default destructors and assignment operators. Note: `SYNTHETIC` takes precedence over `TEMPLATE`.
 
 ```
 // SYNTHETIC: LEGO1 0x10003210