1 files changed, 20 insertions, 3 deletions
diff --git a/MdePkg/Include/Library/PrintLib.h b/MdePkg/Include/Library/PrintLib.h
index 9c65459a59..22df74c65a 100644
--- a/MdePkg/Include/Library/PrintLib.h
+++ b/MdePkg/Include/Library/PrintLib.h
@@ -17,9 +17,26 @@
 #ifndef __PRINT_LIB_H__
 #define __PRINT_LIB_H__
 
-//
-// Print primitives
-//
+///
+/// Define the maximum number of characters that are required to
+/// encode a decimal, hexidecimal, GUID, or TIME value with a NULL 
+/// terminator.
+///  
+///  Maximum Length Decimal String     = 28
+///    "-9,223,372,036,854,775,808"
+///  Maximum Length Hexidecimal String = 17
+///    "FFFFFFFFFFFFFFFF"
+///  Maximum Length GUID               = 37
+///    "00000000-0000-0000-0000-000000000000"
+///  Maximum Length TIME               = 18
+///    "12/12/2006  12:12"
+///
+#define MAXIMUM_VALUE_CHARACTERS  38
+
+///
+/// Flags bitmask values use in UnicodeValueToString() and 
+/// AcsiiValueToString()
+///
 #define LEFT_JUSTIFY      0x01
 #define COMMA_TYPE        0x08
 #define PREFIX_ZERO       0x20