diff --git a/csv_metadata_quality/check.py b/csv_metadata_quality/check.py
index 44fa134..dd94aef 100755
--- a/csv_metadata_quality/check.py
+++ b/csv_metadata_quality/check.py
@@ -165,7 +165,7 @@ def suspicious_characters(field, field_name):
 
 
 def language(field):
-    """Check if a language is valid ISO 639-1 or ISO 639-2.
+    """Check if a language is valid ISO 639-1 (alpha 2) or ISO 639-3 (alpha 3).
 
     Prints the value if it is invalid.
     """
@@ -182,7 +182,7 @@ def language(field):
     for value in field.split("||"):
 
         # After splitting, check if language value is 2 or 3 characters so we
-        # can check it against ISO 639-1 or ISO 639-2 accordingly.
+        # can check it against ISO 639-1 or ISO 639-3 accordingly.
         if len(value) == 2:
             if not languages.get(alpha_2=value):
                 print(f"Invalid ISO 639-1 language: {value}")
@@ -190,7 +190,7 @@ def language(field):
                 pass
         elif len(value) == 3:
             if not languages.get(alpha_3=value):
-                print(f"Invalid ISO 639-2 language: {value}")
+                print(f"Invalid ISO 639-3 language: {value}")
 
                 pass
         else:
diff --git a/tests/test_check.py b/tests/test_check.py
index f3c8151..1bdc414 100644
--- a/tests/test_check.py
+++ b/tests/test_check.py
@@ -129,7 +129,7 @@ def test_check_suspicious_characters(capsys):
 
 
 def test_check_valid_iso639_1_language():
-    '''Test valid ISO 639-1 language.'''
+    '''Test valid ISO 639-1 (alpha 2) language.'''
 
     value = 'ja'
 
@@ -138,8 +138,8 @@ def test_check_valid_iso639_1_language():
     assert result == value
 
 
-def test_check_valid_iso639_2_language():
-    '''Test invalid ISO 639-2 language.'''
+def test_check_valid_iso639_3_language():
+    '''Test valid ISO 639-3 (alpha 3) language.'''
 
     value = 'eng'
 
@@ -149,7 +149,7 @@ def test_check_valid_iso639_2_language():
 
 
 def test_check_invalid_iso639_1_language(capsys):
-    '''Test invalid ISO 639-1 language.'''
+    '''Test invalid ISO 639-1 (alpha 2) language.'''
 
     value = 'jp'
 
@@ -159,15 +159,15 @@ def test_check_invalid_iso639_1_language(capsys):
     assert captured.out == f'Invalid ISO 639-1 language: {value}\n'
 
 
-def test_check_invalid_iso639_2_language(capsys):
-    '''Test invalid ISO 639-2 language.'''
+def test_check_invalid_iso639_3_language(capsys):
+    '''Test invalid ISO 639-3 (alpha 3) language.'''
 
     value = 'chi'
 
     check.language(value)
 
     captured = capsys.readouterr()
-    assert captured.out == f'Invalid ISO 639-2 language: {value}\n'
+    assert captured.out == f'Invalid ISO 639-3 language: {value}\n'
 
 
 def test_check_invalid_language(capsys):