diff --git a/System/mxm/README.md b/System/mxm/README.md
index c651af1..e61dfe4 100644
--- a/System/mxm/README.md
+++ b/System/mxm/README.md
@@ -14,4 +14,8 @@ For the module we use a RPM distributed by HP.
 1. copy all files from `opt/mellanox/mxm` to the module directory
 1. adapt directories in `lib/pkg-config/mxm.pc`
 1. add new variant to `files/variants`
-1. run the build-script to install the modulefile and to set the release
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+1. run the build-script to install the modulefile and to set the release
+ 
+
+> The shared library `libmxm.so`provided by the RPMs for RHEL 6 cannot be used to compile other software.
+They requiry GLIBC >= 2.14, but on RHEL 6 only 2.12 is installed!
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