1 files changed, 3 insertions, 1 deletions

diff --git a/src/eval.c b/src/eval.c
index 9db4d1fd81b..6e964f6604b 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -2033,7 +2033,9 @@ it is defines a macro.  */)
 
 DEFUN ("eval", Feval, Seval, 1, 2, 0,
        doc: /* Evaluate FORM and return its value.
-If LEXICAL is t, evaluate using lexical scoping.  */)
+If LEXICAL is t, evaluate using lexical scoping.
+LEXICAL can also be an actual lexical environment, in the form of an
+alist mapping symbols to their value.  */)
   (Lisp_Object form, Lisp_Object lexical)
 {
   ptrdiff_t count = SPECPDL_INDEX ();