diff --git a/MANUAL.markdown b/MANUAL.markdown
index ca553832..b0596418 100644
--- a/MANUAL.markdown
+++ b/MANUAL.markdown
@@ -1827,13 +1827,15 @@ Spec][SAM]. Specify `--rg` multiple times to set multiple fields. See the
--sam-omit-prim-seq
+
+
When printing primary alignments, Bowtie 2 by default will write out
the `SEQ` and `QUAL` strings. Specifying this option causes Bowtie 2 to
print an asterisk in those fields instead.
+