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-rw-r--r--libX11/specs/libX11/AppC.xml4
1 files changed, 3 insertions, 1 deletions
diff --git a/libX11/specs/libX11/AppC.xml b/libX11/specs/libX11/AppC.xml
index df250275e..0b37048f1 100644
--- a/libX11/specs/libX11/AppC.xml
+++ b/libX11/specs/libX11/AppC.xml
@@ -2468,7 +2468,9 @@ which is the same as
<function>GetReq</function>
except that it takes an additional argument (the number of
extra bytes to allocate in the output buffer after the request structure).
-This number should always be a multiple of four.
+This number should always be a multiple of four. Note that it is possible
+for req to be set to NULL as a defensive measure if the requested length
+exceeds the Xlib's buffer size (normally 16K).
</para>
</sect2>
<sect2 id="Variable_Length_Arguments">