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diff --git a/doc/xml-xcb.txt b/doc/xml-xcb.txt
index 51e641b..b88d182 100644
--- a/doc/xml-xcb.txt
+++ b/doc/xml-xcb.txt
@@ -259,9 +259,9 @@ Expressions
expression expression
The op element represents an operator, with the op attribute specifying
- which operator. The supported operations are *, /, &, and <<, and
- their semantics are identical to the corresponding operators in C. The two
- operand expressions may be fieldref, value, or op elements.
+ which operator. The supported operations are +, -, *, /, &, and
+ <<, and their semantics are identical to the corresponding operators
+ in C. The two operand expressions may be other expression elements.
identifier
@@ -273,3 +273,8 @@ Expressions
The value element represents a literal integer value in an expression. The
integer may be expressed in decimal or hexadecimal.
+
+integer
+
+ The bit element represents a literal bitmask value in an expression.
+ The integer must be in the range 0..31, expanding to (1<