diff --git a/LogicalTypes.md b/LogicalTypes.md
index 8c73f693d..c411dbfad 100644
--- a/LogicalTypes.md
+++ b/LogicalTypes.md
@@ -366,3 +366,7 @@ optional group my_map (MAP_KEY_VALUE) {
 }
 ```
 
+## Null
+Sometimes when discovering the schema of existing data values are always null and there's no type information.
+The `NULL` type can be used to annotates a column that is always null.
+(Similar to Null type in Avro)
diff --git a/src/main/thrift/parquet.thrift b/src/main/thrift/parquet.thrift
index ac4d50eb4..e89bc806c 100644
--- a/src/main/thrift/parquet.thrift
+++ b/src/main/thrift/parquet.thrift
@@ -174,7 +174,13 @@ enum ConvertedType {
    * particular timezone or date.
    */
   INTERVAL = 21;
-  
+
+  /**
+   * Annotates a column that is always null
+   * Sometimes when discovering the schema of existing data
+   * values are always null
+   */
+  NULL = 25;
 }
 
 /**