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-rw-r--r--wm-spec/wm-spec.xml11
1 files changed, 6 insertions, 5 deletions
diff --git a/wm-spec/wm-spec.xml b/wm-spec/wm-spec.xml
index a73dbbc..929dc17 100644
--- a/wm-spec/wm-spec.xml
+++ b/wm-spec/wm-spec.xml
@@ -1483,11 +1483,12 @@ resize the window faster than the client can keep up.
</para>
<para>
The update request number in the client message is determined by the
-window manager, but is generally intended to be incremented by one for
-each message sent. Since the initial value of the XSync counter is not
-defined by this specification, the window manager MAY set the value of
-the XSync counter at any time, and MUST do so when it first manages a
-new window.
+window manager subject to the restriction that it MUST NOT be 0. The
+number is generally intended to be incremented by one for each message
+sent. Since the initial value of the XSync counter is not defined by
+this specification, the window manager MAY set the value of the XSync
+counter at any time, and MUST do so when it first manages a new
+window.
</para>
</sect2>
</sect1>