diff --git a/misc/README.md b/misc/README.md
index 2750409..067738a 100644
--- a/misc/README.md
+++ b/misc/README.md
@@ -17,7 +17,8 @@ minimap2 -cx splice ref.fa rna-seq.fq | splice2bed.js -   # convert splice aln t
   - [Convert SAM to PAF](#sam2paf)
   - [Convert GTF/GFF3 to BED12 format](#gff2bed)
   - [Convert spliced alignment to BED12](#splice2bed)
-  - [Convert spliced alignment to BED12](#eval)
+  - [Evaluating mapping accuracy with simulated reads](#mapeval)
+  - [Evaluating read overlap sensitivity](#oveval)
 
 ## <a name="intro"></a>Introduction
 
@@ -54,7 +55,7 @@ seamlessly works with both GTF and GFF3.
 Script [splice2bed.js](splice2bed.js) converts spliced alignment in SAM or PAF
 to 12-column BED format.
 
-### <a name="eval"></a>Evaluating mapping accuracy with simulated reads
+### <a name="mapeval"></a>Evaluating mapping accuracy with simulated reads
 
 Script [sim-pbsim.js](sim-pbsim.js) converts the MAF output of [pbsim][pbsim]
 to FASTQ and encodes the true mapping position in the read name in a format like
@@ -85,6 +86,11 @@ mappings, accumulative mapping error rate and the accumulative number of
 mapped reads. The U-line gives the number of unmapped reads if they are present
 in the SAM file.
 
+### <a name="oveval"></a>Evaluating read overlap sensitivity
+
+Script [ov-eval.js](ov-eval.js) takes read-to-reference alignment in PAF and
+read overlaps in PAF and evaluates the sensitivity.
+
 [cs]: https://github.com/lh3/minimap2#cs
 [k8]: https://github.com/attractivechaos/k8
 [maf]: https://genome.ucsc.edu/FAQ/FAQformat#format5
diff --git a/misc/ov-eval.js b/misc/ov-eval.js
old mode 100644
new mode 100755
index db8f2eb..7be4a5e
--- a/misc/ov-eval.js
+++ b/misc/ov-eval.js
@@ -1,3 +1,5 @@
+#!/usr/bin/env k8
+
 var getopt = function(args, ostr) {
 	var oli; // option letter list index
 	if (typeof(getopt.place) == 'undefined')