diff --git a/advanced/odata.md b/advanced/odata.md
index ec2151848..13f1ad0ec 100644
--- a/advanced/odata.md
+++ b/advanced/odata.md
@@ -336,14 +336,16 @@ Primitive annotation values, meaning Strings, Numbers, `true`, and `false` are m
 <Annotation Term="Some.String" String="foo"/>
 ```
 
-Rendering a `null` value must be done as dynamic expression or as an [annotation expression](#expression-annotations):
+#### Null Value { #null-value }
+
+A `null` value can be set either as an [annotation expression](#expression-annotations) or as a [dynamic expression](#dynamic-expressions):
 
 ```cds
-@Some.Null: { $edmJson: { $Null } }
-// or
-@Some.Null: (null)
+@Some.NullXpr:  (null)                  // annotation expression, short form
+@Some.NullFunc: ($Null())               // annotation expression, functional form
+@Some.NullDyn:  { $edmJson: { $Null } } // dynamic expression
 ```
-Both result in the following:
+All three expressions result in the following rendering:
 ```xml
 <Annotation Term="Some.Null">
   <Null/>
@@ -662,7 +664,8 @@ The following operators and clauses of CDL are supported:
 * Logical: `and`,  `or`,  `not`
 * Relational: `=`, `<>`,  `!=`,  `<`,  `<=`,  `>`,  `>=`, `in`, `between ... and ...`
 * Unary `+` and `-`
-* Arithmetic: `+`,  `-`,  `*`,  `/`, `||`
+* Arithmetic: `+`,  `-`,  `*`,  `/`
+* Concat: `||`
 * `cast(...)`
 
 Example:
@@ -718,7 +721,7 @@ service S {
 
 In addition, the following functions are supported:
 
-* `$Null()` representing the `null` value
+* `$Null()` representing the `null` value [`Null`]([annotation expression](#null-value)).
 * `Div(...)` (or `$Div(...)`) and `Mod(...)` (or `$Mod(...)`) for integer division and modulo
 * [`Has(...)`](https://docs.oasis-open.org/odata/odata/v4.02/csd01/part2-url-conventions/odata-v4.02-csd01-part2-url-conventions.html#Has) (or `$Has(...)`)
 * the functions listed in sections