diff --git a/readme.txt b/readme.txt
index 9191b83..1df7bea 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2893,7 +2893,7 @@ after which the expression itself can be evaluated.
 
    for (auto& var_name : variable_list)
    {
-      T& v = symbol_table.variable_ref(var_name);
+      T& v = unknown_var_symbol_table.variable_ref(var_name);
 
       v = ...;
    }