diff --git a/src/ast/macros/macro_manager.h b/src/ast/macros/macro_manager.h
index 8f7d0c4b195..57583b67b48 100644
--- a/src/ast/macros/macro_manager.h
+++ b/src/ast/macros/macro_manager.h
@@ -29,7 +29,7 @@ Revision History:
    \brief Macros are universally quantified formulas of the form:
      (forall X  (= (f X) T[X]))
      (forall X  (iff (f X) T[X]))
-   where T[X] does not contain X.
+   where T[X] does not contain f.
 
    This class is responsible for storing macros and expanding them.
    It has support for backtracking and tagging declarations in an expression as forbidded for being macros.