Added comments in example.

tests/example1_on_the_fly.mod

-// Example 1 from Collard's guide to Dynare
+// --+ options: nostrict +--
+/*
+** In the following example, the types (exogenous variable, endogenous variable, parameter) of the objects appearing in the model are declared
+** on the fly in the equations. With the nostrict option, an object is by default an exogenous variable (if the type of an object is not declared
+** in one of the equations, it will be interpreted as an exogenous variable). Without the nostrict option, Dynare will raise an error if the model
+** contains untyped objects.
+**
+** An object followed by |e is an endogenous variable,
+**                       |x is an exogenous variable,
+**                       |p is a parameter.
+**
+** Example. If the first equation (consumption/leisure arbitrage) is removed from the following model block, then h (hours)
+** will be interpreted as an exogenous variable.
+*/
+
 model;
-c|e*theta|p*h|e^(1+psi|p)=(1-alpha)*y;
+c*theta|p*h|e^(1+psi|p)=(1-alpha)*y;
 k|e = beta|p*(((exp(b)*c)/(exp(b(+1))*c(+1)))
     *(exp(b(+1))*alpha|p*y(+1)+(1-delta)*k));
 y|e = exp(a)*(k(-1)^alpha)*(h^(1-alpha));
-k = exp(b)*(y-c)+(1-delta|p)*k(-1);
+k = exp(b)*(y-c|e)+(1-delta|p)*k(-1);
 a|e = rho|p*a(-1)+tau*b(-1) + e|x;
 b|e = tau|p*a(-1)+rho*b(-1) + u|x;
 end;