diff --git a/src/functionObjects/field/AMIWeights/AMIWeights.H b/src/functionObjects/field/AMIWeights/AMIWeights.H
index 30b6161071..a682d382fd 100644
--- a/src/functionObjects/field/AMIWeights/AMIWeights.H
+++ b/src/functionObjects/field/AMIWeights/AMIWeights.H
@@ -30,6 +30,9 @@ Group
     grpFieldFunctionObjects
 
 Description
+    Reports the min/max/average AMI weights to text file and optionally
+    writes VTK surfaces of the sum of the weights, and mask field for
+    ACMI patches.
 
 Usage
     Example of function object specification:
diff --git a/src/functionObjects/field/fieldsExpression/fieldsExpression.H b/src/functionObjects/field/fieldsExpression/fieldsExpression.H
index f09a8d404a..9f5c8ed6c1 100644
--- a/src/functionObjects/field/fieldsExpression/fieldsExpression.H
+++ b/src/functionObjects/field/fieldsExpression/fieldsExpression.H
@@ -31,6 +31,7 @@ Group
     grpFieldFunctionObjects
 
 Description
+    Intermediate class for handling field expressions (add, subtract etc).
 
 See also
     Foam::functionObjects::fvMeshFunctionObject