diff --git a/README.md b/README.md
index cffc8e7..f927756 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,10 @@ Converts tsv data into a human-readable table.
 ## --header=auto
 
 When the `--header=auto` option is specified, a simple heuristic is applied to
-determine the presence of a header. This determination is made by examining the
-first and the seconds rows of data. If the first row exclusively contains
-string values, and the second row contains values that are not strings, it is
-inferred that the data has a header.
+detect the presence of a header. This detection is made by examining the
+first and the second rows of data. If the first row contains only
+string values, and the second row contains non-string values,
+then it is considered that the data has a header.
 
 ## Project Repository
 
diff --git a/tests/data/help/cmd_and_expected_output b/tests/data/help/cmd_and_expected_output
index 1119f9e..1267dbe 100644
--- a/tests/data/help/cmd_and_expected_output
+++ b/tests/data/help/cmd_and_expected_output
@@ -18,10 +18,10 @@ Converts tsv data into a human-readable table.
 ## --header=auto
 
 When the `--header=auto` option is specified, a simple heuristic is applied to
-determine the presence of a header. This determination is made by examining the
-first and the seconds rows of data. If the first row exclusively contains
-string values, and the second row contains values that are not strings, it is
-inferred that the data has a header.
+detect the presence of a header. This detection is made by examining the
+first and the second rows of data. If the first row contains only
+string values, and the second row contains non-string values,
+then it is considered that the data has a header.
 
 ## Project Repository
 
diff --git a/tsv2table b/tsv2table
index e62e54e..1282de5 100755
--- a/tsv2table
+++ b/tsv2table
@@ -41,10 +41,10 @@ Converts tsv data into a human-readable table.
 ## --header=auto
 
 When the `--header=auto` option is specified, a simple heuristic is applied to
-determine the presence of a header. This determination is made by examining the
-first and the seconds rows of data. If the first row exclusively contains
-string values, and the second row contains values that are not strings, it is
-inferred that the data has a header.
+detect the presence of a header. This detection is made by examining the
+first and the second rows of data. If the first row contains only
+string values, and the second row contains non-string values,
+then it is considered that the data has a header.
 
 ## Project Repository