small changes by Soren Larsen
diff --git a/Doc/lib/libimp.tex b/Doc/lib/libimp.tex
index 72f71a2..9ead176 100644
--- a/Doc/lib/libimp.tex
+++ b/Doc/lib/libimp.tex
@@ -39,7 +39,8 @@
Initialize the built-in module called \var{name} and return its module
object. If the module was already initialized, it will be initialized
{\em again}. A few modules cannot be initialized twice --- attempting
-to initialize these again will raise an exception. If there is no
+to initialize these again will raise an \code{ImportError} exception.
+If there is no
built-in module called \var{name}, \code{None} is returned.
\end{funcdesc}