issue1172: Documentation of "done" attribute in cgi module.
diff --git a/Doc/lib/libcgi.tex b/Doc/lib/libcgi.tex
index 1dd7e03..971a6ad 100644
--- a/Doc/lib/libcgi.tex
+++ b/Doc/lib/libcgi.tex
@@ -162,6 +162,11 @@
linecount = linecount + 1
\end{verbatim}
+If an error is encountered when obtaining the contents of an uploaded file
+(for example, when the user interrupts the form submission by clicking on
+a Back or Cancel button) the \member{done} attribute of the object for the
+field will be set to the value -1.
+
The file upload draft standard entertains the possibility of uploading
multiple files from one field (using a recursive
\mimetype{multipart/*} encoding). When this occurs, the item will be