minor wording changes

README.md

@@ -184,9 +184,8 @@ according to the sequence divergence.
 Due to a design flaw, BAM does not work with CIGAR strings with >65535
 operations (SAM and CRAM work). However, for ultra-long nanopore reads minimap2
 may align ~1% of read bases with long CIGARs beyond the capability of BAM. If
-you convert such SAM/CRAM to BAM, recent samtools will throw an error and
-abort.  Older samtools and other tools may even silently create corrupted and
-unreadable BAMs.
+you convert such SAM/CRAM to BAM, Picard and recent samtools will throw an
+error and abort. Older samtools and other tools may create corrupted BAM.
 
 To avoid this issue, you can add option `-L` at the minimap2 command line.
 This option moves a long CIGAR to the `CG` tag and leaves a fully clipped CIGAR
@@ -197,7 +196,7 @@ htsjdk, bedtools2, Rsamtools and igv.js. If they are accepted, future versions
 of these tools will seamlessly recognize long-cigar records generated by option
 `-L`.
 
-In summary, if you work with ultra-long reads and use tools that only process
+**TD;DR**: if you work with ultra-long reads and use tools that only process
 BAM files, please add option `-L`.
 
 #### <a name="cs"></a>The cs optional tag