Expand reference manual on loglinear.

Partial cherry-pick of 3fc2e2b967d7c779058922e9f7fd9f688118a2f0 by Johannes Pfeifer.

doc/dynare.texi

@@ -2626,13 +2626,18 @@ Moreover, as only states enter the recursive policy functions, all values specif
 @itemize
 @item
-in @ref{stoch_simul}, if the @code{periods} option is specified. Note that this only affects the starting point for the simulation, but not for the impulse response functions.
+in @ref{stoch_simul}, if the @code{periods} option is specified. Note that this
+only affects the starting point for the simulation, but not for the impulse
+response functions. When using the @ref{loglinear} option, the
+@code{histval}-block nevertheless takes the unlogged starting values.
 @item
-in @ref{forecast} as the initial point at which the forecasts are computed
+in @ref{forecast} as the initial point at which the forecasts are computed. When using the @ref{loglinear} option, 
+the @code{histval}-block nevertheless takes the unlogged starting values.
 @item
-in @ref{conditional_forecast} for a calibrated model as the initial point at which the conditional forecasts are computed
+in @ref{conditional_forecast} for a calibrated model as the initial point at which the conditional forecasts are computed.
+When using the @ref{loglinear} option, the @code{histval}-block nevertheless takes the unlogged starting values.
 @item 
 in @ref{Ramsey} policy, where it also specifies the values of the endogenous states at 
@@ -5154,9 +5159,10 @@ first observation of the rolling window.
 @item prefilter = @var{INTEGER}
-@anchor{prefilter}
-A value of @code{1} means that the estimation procedure will demean
-each data series by its empirical mean. If the (@ref{loglinear}) option without the (@ref{logdata}) option is requested, the data will first be logged and then demeaned. Default: @code{0}, @i{i.e.} no prefiltering
+@anchor{prefilter} A value of @code{1} means that the estimation procedure will
+demean each data series by its empirical mean. If the @ref{loglinear} option
+without the @ref{logdata} option is requested, the data will first be logged
+and then demeaned. Default: @code{0}, @i{i.e.} no prefiltering
 @item presample = @var{INTEGER}
 @anchor{presample}
@@ -7742,8 +7748,8 @@ is not specified, a value of 0 is assumed. That is, if you specify only
 values for periods 1 and 3, the values for period 2 will be 0. Currently, it is not 
 possible to have uncontrolled intermediate periods.
 In case of the presence of @code{observation_trends}, the specified controlled path for 
-these variables needs to include the trend component.
-
+these variables needs to include the trend component. When using the @ref{loglinear} option, 
+it is necessary to specify the logarithm of the controlled variables.
 @end deffn