diff --git a/Makefiles/Makefile.in.bgq b/Makefiles/Makefile.in.bgq
index 0dc4b987c1ae3b428d6ca7c179919211d4a4880e..b36e2bf47532302fe7541711521b9c7ae2a92c3e 100644
--- a/Makefiles/Makefile.in.bgq
+++ b/Makefiles/Makefile.in.bgq
@@ -66,6 +66,7 @@ USE_OPENMP     = YES
 #              Only some pack/unpack routines are implemented with OpenMP to test it.
 #              Check test_nb3dfft_detailed to see, if it helps you and implement the missing functions yourself.
 # only available if USE_OPENMP=YES
+# MUST be "NO" FOR BlueGene as it does not support nested fully !!
 LOOP_OPENMP    = NO
 # more: PACKMEMCP, PACKLOOP