diff --git a/README.md b/README.md
index 16041a1..398e1b2 100644
--- a/README.md
+++ b/README.md
@@ -255,7 +255,7 @@ Module to map reads on 3-letter converted genome.
                             CH sites)>0.8 and #(mCH sites)>5, then tag XS:i:1; or
                             else tag XS:i:0. [Default: 0.5,5]
         --XSteve            Filter definition for tag XS, proposed by Prof. Steve
-                            Jacobson, reads with at least 3 successive mCHH will
+                            Jacobsen, reads with at least 3 successive mCHH will
                             be labeled as XS:i:1,useful for plant genome, which
                             have high mCHG level. Will override --XS option.
         -M FileName, --multiple-hit=FileName
diff --git a/bs_seeker2-align.py b/bs_seeker2-align.py
index a76d70d..50ade0f 100755
--- a/bs_seeker2-align.py
+++ b/bs_seeker2-align.py
@@ -92,7 +92,7 @@
                               " or else tag XS:i:0. [Default: %default]", default = "0.5,5") # added by weilong
     #
     opt_group.add_option("--XSteve", action="store_true", dest="XSteve",
-                         help="Filter definition for tag XS, proposed by Prof. Steve Jacobson, "
+                         help="Filter definition for tag XS, proposed by Prof. Steve Jacobsen, "
                               "reads with at least 3 successive mCHH will be labeled as XS:i:1,"
                               "useful for plant genome, which have high mCHG level. "
                               "Will override --XS option.", default = False) # added by weilong