Emphasized the ProjectTo method call location

docs/Queryable-Extensions.md

@@ -56,9 +56,11 @@ public List<OrderLineDTO> GetLinesForOrder(int orderId)
 ```
 
 The `.ProjectTo<OrderLineDTO>()` will tell AutoMapper's mapping engine to emit a `select` clause to the IQueryable that will inform entity framework that it only needs to query the Name column of the Item table, same as if you manually projected your `IQueryable` to an `OrderLineDTO` with a `Select` clause.
-
-`ProjectTo` must be the last call in the chain. ORMs work with entities, not DTOs. So apply any filtering and sorting on entities and, as the last step, project to DTOs.
-
+
+### Query Provider Limitations
+
+`ProjectTo` must be the last call in the LINQ method chain. ORMs work with entities, not DTOs. Apply any filtering and sorting on entities and, as the last step, project to DTOs. Query providers are highly complex and making the `ProjectTo` call last ensures the query provider works as closely as designed to build valid queries against the underlying query target (SQL, Mongo QL etc.).
+
 Note that for this feature to work, all type conversions must be explicitly handled in your Mapping. For example, you can not rely on the `ToString()` override of the `Item` class to inform entity framework to only select from the `Name` column, and any data type changes, such as `Double` to `Decimal` must be explicitly handled as well.
 
 ### The instance API
@@ -208,7 +210,7 @@ Not all mapping options can be supported, as the expression generated must be in
 * ConvertUsing (Expression-based)
 * Ignore
 * NullSubstitute
-* Value transformers
+* Value transformers
 * IncludeMembers
 
 Not supported: