diff --git a/src/functionObjects/field/fieldsExpression/fieldsExpression.H b/src/functionObjects/field/fieldsExpression/fieldsExpression.H
index 030b870d7c..5bdc191f15 100644
--- a/src/functionObjects/field/fieldsExpression/fieldsExpression.H
+++ b/src/functionObjects/field/fieldsExpression/fieldsExpression.H
@@ -25,12 +25,14 @@ Class
     Foam::functionObjects::fieldsExpression
 
 Description
+    Base class for expressions involving multiple fields
 
 See also
     Foam::functionObjects::fvMeshFunctionObject
 
 SourceFiles
     fieldsExpression.C
+    fieldsExpressionTemplates.C
 
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