diff --git a/scribblings/txexpr.scrbl b/scribblings/txexpr.scrbl
index f1ecd9b..0b948a9 100644
--- a/scribblings/txexpr.scrbl
+++ b/scribblings/txexpr.scrbl
@@ -35,7 +35,7 @@ Fast mode is the default, which you get by importing the module in the usual way
 Safe mode enables the function contracts documented below. Use safe mode by importing the module as @code{(require (submod txexpr safe))}.
 
 
-@section{What’s a txexpr?}
+@section{What’s a tagged X-expression (aka txexpr)?}
 
 It's an X-expression with the following grammar: