Added documentation about pre and post dynare preprocessor hooks.

doc/dynare.texi

@@ -160,10 +160,12 @@ Configuration
 Running Dynare
 
 * Dynare invocation::
+* Dynare hooks::
 * Understanding Preprocessor Error Messages::
 
 Dynare invocation
 
+* Dynare hooks
 * Understanding Preprocessor Error Messages::
 
 The Model file
@@ -638,6 +640,7 @@ required by the user. Its contents is described in @ref{The Model file}.
 
 @menu
 * Dynare invocation::
+* Dynare hooks::
 * Understanding Preprocessor Error Messages::
 @end menu
 
@@ -814,6 +817,20 @@ during the computation.
 Structure containing the various results of the computations.
 @end defvr
 
+
+@node Dynare hooks
+@section Dynare hooks
+
+It is possible to call pre and post dynare preprocessor hooks written as matlab scripts.
+The script @file{@var{FILENAME}_pre_dynare_preprocessor_hook.m} is executed before the
+call to Dynare's preprocessor, and  can be used to programatically transform the mod file
+that will be read by the preprocessor. The script @file{@var{FILENAME}_post_dynare_preprocessor_hook.m}
+is executed just after the call to Dynare's preprocessor, and can be used to programatically
+transform the files generated by Dynare's preprocessor before actual computations start. The
+pre and/or post dynare preprocessor kooks are executed if and only if the afordmentionned scripts
+are detected in the same folder as the the model file, @file{@var{FILENAME}.mod}.
+
+
 @node Understanding Preprocessor Error Messages
 @section Understanding Preprocessor Error Messages