diff --git a/darshan-util/darshan-job-summary/bin/darshan-job-summary.pl.in b/darshan-util/darshan-job-summary/bin/darshan-job-summary.pl.in
index 6db447150173e980442e8e54ef60816ef55a8a0c..8af8fa369b27a6a4013c65fa206a8bf52eec8b26 100755
--- a/darshan-util/darshan-job-summary/bin/darshan-job-summary.pl.in
+++ b/darshan-util/darshan-job-summary/bin/darshan-job-summary.pl.in
@@ -592,6 +592,7 @@ print ACCESS_TABLE "
 \\begin{tabular}{r|r|r}
 \\multicolumn{3}{c}{ } \\\\
 \\multicolumn{3}{c}{Most Common Access Sizes} \\\\
+\\multicolumn{3}{c}{(POSIX or MPI-IO)} \\\\
 \\hline
 \& access size \& count \\\\
 \\hline