Fixup, paragraph lost since 3.23.41 (noted by Carsten Pederson).

Docs/manual.texi

@@ -33777,6 +33777,12 @@ semantically equivalent to an @code{INNER JOIN} or a @code{LEFT JOIN}
 with a @code{USING} clause that names all columns that exist in both
 tables.
 
+@item
+@cindex hints
+@code{INNER JOIN} and @code{,} (comma) are semantically equivalent.
+Both do a full join between the tables used. Normally, you specify
+how the tables should be linked in the WHERE condition.
+
 @item
 @code{RIGHT JOIN} works analogously as @code{LEFT JOIN}.  To keep code
 portable across databases, it's recommended to use @code{LEFT JOIN}