diff --git a/MaskedTextBox.md b/MaskedTextBox.md
index 07ae479..861ad4a 100644
--- a/MaskedTextBox.md
+++ b/MaskedTextBox.md
@@ -92,7 +92,7 @@ Mode=TwoWay}"/>
 | ? | Letter, optional. Restricts input to the ASCII letters a-z and A-Z. This mask element is equivalent to [a-zA-Z](a-zA-Z)? in regular expressions. |
 | & | Character, required. If the AsciiOnly property is set to true, this element behaves like the "L" element. |
 | C | Character, optional. Any non-control character. If the AsciiOnly property is set to true, this element behaves like the "?" element. |
-| A | Alphanumeric, optional. If the AsciiOnly property is set to true, the only characters it will accept are the ASCII letters a-z and A-Z. |
+| A | Alphanumeric, required. If the AsciiOnly property is set to true, the only characters it will accept are the ASCII letters a-z and A-Z. |
 | a | Alphanumeric, optional. If the AsciiOnly property is set to true, the only characters it will accept are the ASCII letters a-z and A-Z. |
 | . | Decimal placeholder. The actual display character used will be the decimal symbol appropriate to the format provider, as determined by the control's FormatProvider property. |
 | , | Thousands placeholder. The actual display character used will be the thousands placeholder appropriate to the format provider, as determined by the control's FormatProvider property. |