diff --git a/Makefile b/Makefile
index be807a4..0eb68f1 100644
--- a/Makefile
+++ b/Makefile
@@ -4,13 +4,13 @@
 DOCNAME = SIA
 
 # count up; you probably do not want to bother with versions <1.0
-DOCVERSION = 2.0
+DOCVERSION = 2.1
 
 # Publication date, ISO format; update manually for "releases"
-DOCDATE = 2015-12-23
+DOCDATE = 2022-04-26
 
 # What is it you're writing: NOTE, WD, PR, or REC
-DOCTYPE = REC
+DOCTYPE = WD
 
 AUTHOR_EMAIL=francois.bonnarel@astro.unistra.fr
 
diff --git a/SIA.tex b/SIA.tex
index 7da426d..7770c64 100644
--- a/SIA.tex
+++ b/SIA.tex
@@ -190,6 +190,19 @@ \subsection{\{query\} resource}
 The sections describing query parameters make use of fixed reference systems and units to simplify client and service implementation. These choices are not suitable for all domains; the values are chosen to enable the {query} resource to be used to search for most standard observational astronomy data. If they are not suitable for a specific domain of interest (e.g. planetary science) then it is feasible to write a very short standard that re-uses the SIA {query} capability but redefines the hard-coded systems and units. This new standard would have a new standardID to distinguish services that implement it from those that implement the capability defined here.
 
 
+\subsubsection{MOC}
+The MOC parameter defines a spatial, temporal or combination of both subset of space-time to be searched using the \xtype{moc} defined in DALI. The parameter syntax is defined as in the MOC specification \citep{MOC2}
+
+Examples :
+\begin{itemize}
+
+\item Searching in cells 1 and 2 at order 1 will read this way MOC = 1/1 2
+\item Searching in cells 1 at order 1 and cells 1 to 6 at order 2 will read MOC = 1/1 2/1-6
+\item Searching in time cell 1 at order 61 in in combination with spatial cells 0 to 2 at order 29 will read this way MOC = t61/1 s29/0-2 	
+
+\end{itemize}
+
+