diff --git a/doc/man/man5/slurm.conf.5 b/doc/man/man5/slurm.conf.5
index 0f5cdedb6b6d6a6f9546d42247b1b92ae117f676..ea6b35bad94040c6e374147834bc4a35bc042982 100644
--- a/doc/man/man5/slurm.conf.5
+++ b/doc/man/man5/slurm.conf.5
@@ -3341,6 +3341,8 @@ should be used for job allocations.
 Sharing of resources is typically useful only when using gang scheduling
 (\fBPreemptMode=suspend\fR or \fBPreemptMode=kill\fR).
 Possible values for \fBShared\fR are "EXCLUSIVE", "FORCE", "YES", and "NO".
+Note that a value of "YES" or "FORCE" can negatively impact performance
+for systems with many thousands of running jobs.
 The default value is "NO".
 For more information see the following web pages:
 .br