diff --git a/auchann/align_words.py b/auchann/align_words.py
index 71aaced..08bdf85 100644
--- a/auchann/align_words.py
+++ b/auchann/align_words.py
@@ -14,6 +14,17 @@ class TokenOperation(Enum):
 
 
 class TokenCorrection:
+    """Represents a way in which a (group of) token(s) can be represented
+    in a CHAT annotation.
+
+    Params:
+        insert: token(s) to potentially replace a token or be inserted
+                in the annotation (derived from correction string)
+        remove: token(s) to potentially be removed or replaced in the
+                annotation (derived form the transcript string)
+        operation: INSERT, REPLACE, REMOVE, or COPY
+        is_filler/is_fragment: True if removed token is a filler or fragment
+    """
     insert: List[Optional[str]]
     remove: List[Optional[str]]
     operation: TokenOperation
@@ -64,6 +75,7 @@ def __str__(self):
             return f'UNKNOWN OPERATION {self.operation}'
 
     def __str__remove(self):
+        """Adds special annotations for specific remove operations"""
         remove = ' '.join(self.remove)
         if self.is_filler:
             return f'&-{remove}'
@@ -417,6 +429,7 @@ def align_split(self,
                     transcript_offset+1, correction_offset+lookahead)
                 distance = sum(len(token)
                                for token in correction_tokens) - len(transcript_token)
+                distance += len(correction_tokens) - 1  # number of spaces added
 
                 corrections += prepend_correction(
                     correction,
diff --git a/unit-tests/test_align.py b/unit-tests/test_align.py
index 7bf0827..66934d0 100644
--- a/unit-tests/test_align.py
+++ b/unit-tests/test_align.py
@@ -6,7 +6,7 @@ def test_replace():
     correction_line = "doet zij even de armen weg"
     expected_chat_line = "doet zij even de armen wes [: weg]"
 
-    assertAlign(transcript_line, correction_line, expected_chat_line)
+    assert_align(transcript_line, correction_line, expected_chat_line)
 
 
 def test_remove():
@@ -14,15 +14,18 @@ def test_remove():
     correction_line = "alleen dit"
     expected_chat_line = "alleen dit [/] dit"
 
-    assertAlign(transcript_line, correction_line, expected_chat_line)
+    assert_align(transcript_line, correction_line, expected_chat_line)
 
 
 def test_insert():
-    transcript_line = "magge zien"
-    correction_line = "mag ik zien"
-    expected_chat_line = "magge [: mag] 0ik zien"
+    data = [
+        ("magge zien", "mag ik zien", "magge [: mag] 0ik zien"),
+        ("dit is huis", "dit is het huis", "dit is 0het huis"),
+        ("dit is huis ja", "dit is het huis ja", "dit is 0het huis ja")
+    ]
 
-    assertAlign(transcript_line, correction_line, expected_chat_line)
+    for transcript_line, correction_line, expected_chat_line in data:
+        assert_align(transcript_line, correction_line, expected_chat_line)
 
 
 def test_repetition():
@@ -30,7 +33,7 @@ def test_repetition():
     correction_line = "toen kwam hij bij een weiland"
     expected_chat_line = "toen kwam hij bij een [/] een weiland"
 
-    assertAlign(transcript_line, correction_line, expected_chat_line)
+    assert_align(transcript_line, correction_line, expected_chat_line)
 
 
 def test_error_detection():
@@ -38,7 +41,7 @@ def test_error_detection():
     correction_line = "het meisje sliep thuis"
     expected_chat_line = "de [: het] [* s:r:gc:art] meisje slaapte [: sliep] [* m] thuis"
 
-    assertAlign(transcript_line, correction_line, expected_chat_line)
+    assert_align(transcript_line, correction_line, expected_chat_line)
 
 
 def test_split():
@@ -67,10 +70,10 @@ def test_multi_word():
     ]
 
     for transcript_line, correction_line, expected_chat_line in data:
-        assertAlign(transcript_line, correction_line, expected_chat_line)
+        assert_align(transcript_line, correction_line, expected_chat_line)
 
 
-def assertAlign(transcript_line: str, correction_line: str, expected_chat_line: str):
+def assert_align(transcript_line: str, correction_line: str, expected_chat_line: str):
     settings = AlignmentSettings()
     def detect_error(original: str, correction: str):
         if original == "slaapte" and correction == "sliep":