diff --git a/Doc/liballos.tex b/Doc/liballos.tex
index b5a207e..c167109 100644
--- a/Doc/liballos.tex
+++ b/Doc/liballos.tex
@@ -20,4 +20,7 @@
 \item[tempfile]
 --- Generate temporary file names.
 
+\item[errno]
+--- Standard errno system symbols.
+
 \end{description}