add index entries for list comprehensions
diff --git a/Doc/ref/ref5.tex b/Doc/ref/ref5.tex
index 55725d1..1d2f6fe 100644
--- a/Doc/ref/ref5.tex
+++ b/Doc/ref/ref5.tex
@@ -147,6 +147,7 @@
\subsection{List displays\label{lists}}
\indexii{list}{display}
+\indexii{list}{comprehensions}
A list display is a possibly empty series of expressions enclosed in
square brackets:
@@ -161,6 +162,7 @@
A list display yields a new list object. Its contents are specified
by providing either a list of expressions or a list comprehension.
+\indexii{list}{comprehensions}
When a comma-separated list of expressions is supplied, its elements are
evaluated from left to right and placed into the list object in that
order. When a list comprehension is supplied, it consists of a