diff --git a/src/Database/Type/BinaryType.php b/src/Database/Type/BinaryType.php
index 74ea1cde4ee..21b2ee6cb8e 100644
--- a/src/Database/Type/BinaryType.php
+++ b/src/Database/Type/BinaryType.php
@@ -31,7 +31,7 @@ class BinaryType implements TypeInterface
     /**
      * Identifier name for this type
      *
-     * @var string
+     * @var string|null
      */
     protected $_name = null;
 
diff --git a/src/Database/Type/BoolType.php b/src/Database/Type/BoolType.php
index 5223b25cce8..1531f88d6da 100644
--- a/src/Database/Type/BoolType.php
+++ b/src/Database/Type/BoolType.php
@@ -30,7 +30,7 @@ class BoolType implements TypeInterface
     /**
      * Identifier name for this type
      *
-     * @var string
+     * @var string|null
      */
     protected $_name = null;
 
diff --git a/src/Database/Type/DateTimeType.php b/src/Database/Type/DateTimeType.php
index af3df49a64e..4f14dc053a6 100644
--- a/src/Database/Type/DateTimeType.php
+++ b/src/Database/Type/DateTimeType.php
@@ -80,7 +80,7 @@ class DateTimeType implements TypeInterface
     /**
      * Identifier name for this type
      *
-     * @var string
+     * @var string|null
      */
     protected $_name = null;
 
diff --git a/src/Database/Type/FloatType.php b/src/Database/Type/FloatType.php
index 7ef88531871..e450564bc74 100644
--- a/src/Database/Type/FloatType.php
+++ b/src/Database/Type/FloatType.php
@@ -30,7 +30,7 @@ class FloatType implements TypeInterface
     /**
      * Identifier name for this type
      *
-     * @var string
+     * @var string|null
      */
     protected $_name = null;
 
diff --git a/src/Database/Type/IntegerType.php b/src/Database/Type/IntegerType.php
index bfa798bb404..7722137c278 100644
--- a/src/Database/Type/IntegerType.php
+++ b/src/Database/Type/IntegerType.php
@@ -30,7 +30,7 @@ class IntegerType implements TypeInterface
     /**
      * Identifier name for this type
      *
-     * @var string
+     * @var string|null
      */
     protected $_name = null;