diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi
index 43c9ee8..995c8be 100644
--- a/gcc/doc/rtl.texi
+++ b/gcc/doc/rtl.texi
@@ -3283,7 +3283,8 @@ Represents the use of the value of @var{x}.  It indicates that the
 value in @var{x} at this point in the program is needed, even though
 it may not be apparent why this is so.  Therefore, the compiler will
 not attempt to delete previous instructions whose only effect is to
-store a value in @var{x}.  @var{x} must be a @code{reg} expression.
+store a value in @var{x}.  @var{x} must be a @code{reg} or a @code{mem}
+expression.
 
 In some situations, it may be tempting to add a @code{use} of a
 register in a @code{parallel} to describe a situation where the value