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git-svn-id: svn://svn.icms.temple.edu/lammps-ro/trunk@13786 f3b2605a-c512-4ea7-a41b-209d697bcdaa

doc/doc2/fix_shake.html

@@ -226,6 +226,9 @@ which can lead to poor energy conservation.  You can test for this in
 your system by running a constant NVE simulation with a particular set
 of SHAKE parameters and monitoring the energy versus time.
 </P>
+<P>SHAKE or RATTLE should not be used to contrain an angle at 180 degrees
+(e.g. linear CO2 molecule).  This causes numeric difficulties.
+</P>
 <P><B>Related commands:</B> none
 </P>
 <P><B>Default:</B> none