diff --git a/doc/manual/source/the-model-file.rst b/doc/manual/source/the-model-file.rst
index 08955a0fd..e338b0cfb 100644
--- a/doc/manual/source/the-model-file.rst
+++ b/doc/manual/source/the-model-file.rst
@@ -578,6 +578,9 @@ not in EXPRESSION):
     you may want to use the value of GDP at steady state to compute
     the output gap.
 
+    Exogenous and exogenous deterministic variables may not appear in
+    MODEL_EXPRESSION.
+
 .. operator:: EXPECTATION (INTEGER) (MODEL_EXPRESSION)
 
     This operator is used to take the expectation of some expression
diff --git a/preprocessor b/preprocessor
index 1ec3923a6..d008113d6 160000
--- a/preprocessor
+++ b/preprocessor
@@ -1 +1 @@
-Subproject commit 1ec3923a6b9075526a24947ae10dab25b9a0d5d4
+Subproject commit d008113d69137b4600e61758df1721c534c6a9c1