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diff --git a/doc/xml-xcb.txt b/doc/xml-xcb.txt
index 7057727..cf6d14e 100644
--- a/doc/xml-xcb.txt
+++ b/doc/xml-xcb.txt
@@ -229,13 +229,18 @@ enum; the value is restricted to one of the constants named in the enum.
instead for new protocol definitions.
switch expression
- bitcase expression, fields
+ bitcase expression(s), fields
This element represents conditional inclusion of fields. It can be viewed
as sequence of multiple ifs: if ( switch expression & bitcase expression )
- is equal to bitcase expression, bitcase fields are included in structure.
- It can be used only as the last field of structure. New protocol definitions
- should prefer to use this instead of .
+ is non-zero, bitcase fields are included in structure. It can be used only
+ as the last field of a structure.
+
+ When a bitcase includes multiple clauses, the contents of the
+ bitcase are only present once regardless of the number of bitcase expressions
+ that match.
+
+ New protocol definitions should prefer to use this instead of .
Expressions
-----------