From c9a0d38a3effa82a95decbfaa3a8145aa0545260 Mon Sep 17 00:00:00 2001
From: Axel Kohlmeyer <akohlmey@gmail.com>
Date: Mon, 10 Jul 2017 17:34:00 -0400
Subject: [PATCH] mention restriction for use with fix shake or fix rigid in
 fix gcmc docs

---
 doc/src/fix_gcmc.txt | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/doc/src/fix_gcmc.txt b/doc/src/fix_gcmc.txt
index 41ec38cffb..405738276f 100644
--- a/doc/src/fix_gcmc.txt
+++ b/doc/src/fix_gcmc.txt
@@ -383,6 +383,9 @@ called.  Reneighboring is required.
 Can be run in parallel, but aspects of the GCMC part will not scale
 well in parallel. Only usable for 3D simulations.
 
+When using fix gcmc in combination with fix shake or fix rigid,
+only gcmc exchange moves are supported.
+
 Note that very lengthy simulations involving insertions/deletions of
 billions of gas molecules may run out of atom or molecule IDs and
 trigger an error, so it is better to run multiple shorter-duration
-- 
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