diff --git a/k2t.py b/k2t.py
index cb8abad..11311cb 100644
--- a/k2t.py
+++ b/k2t.py
@@ -1,9 +1,84 @@
+"""
+Functions from converting between KLayout layer properties files and a custom TOML format
+"""
 from typing import Self, Type, Any
 import tomllib
 from dataclasses import dataclass, fields
 from xml.etree import ElementTree
 
 
+def k2t(kfile: str, tfile: str) -> None:
+    """
+    Convert from KLayout layer properties xml (.lyp) to TOML
+
+    Args:
+        kfile: Path to klayout lyp file (input)
+        tfile: Path for TOML file (output)
+    """
+    tree = ElementTree.parse(kfile)
+    root = tree.getroot()
+
+    assert root.tag == 'layer-properties'
+    name = None
+    entries = []
+    patterns = []
+    linestyles = []
+    for child in root:
+        if child.tag == 'custom-dither-pattern':
+            patterns.append(Pattern.from_xml(child))
+        elif child.tag == 'custom-line-style':
+            linestyles.append(LineStyle.from_xml(child))
+        elif child.tag == 'properties':
+            entries.append(Entry.from_xml(child))
+        elif child.tag == 'name':
+            name = child.text
+        else:
+            raise Exception(f'Unexpected tag: {child.tag}')
+
+    if name is not None:
+        print(f'Discarding tab name: {name}')
+
+    with open(tfile, 'wt') as ff:
+        for entry in entries:
+            ff.write(entry.to_toml())
+        for pattern in patterns:
+            ff.write(pattern.to_toml())
+        for linestyle in linestyles:
+            ff.write(linestyle.to_toml())
+
+
+def t2k(tfile: str, kfile: str) -> None:
+    """
+    Convert from TOML to KLayout layer properties xml (.lyp)
+
+    Args:
+        tfile: Path to TOML file (input)
+        kfile: Path for klayout lyp file (output)
+    """
+    root = ElementTree.Element('layer-properties')
+
+    with open(tfile, 'rb') as ff:
+        ttree = tomllib.load(ff)
+
+    entries = [Entry.from_toml(entry)
+               for entry in ttree['layers']]
+    patterns = [Pattern.from_toml(pat)
+                for pat in ttree['patterns']]
+    linestyles = [LineStyle.from_toml(ls)
+                  for ls in ttree['linestyles']]
+
+    for entry in entries:
+        root.append(entry.to_xml())
+    for pattern in patterns:
+        root.append(pattern.to_xml())
+    for linestyle in linestyles:
+        root.append(linestyle.to_xml())
+
+    ktree = ElementTree.ElementTree(root)
+    ElementTree.indent(ktree)
+    ktree.write(kfile)
+
+
 @dataclass(slots=True)
 class Entry:
     name: str
@@ -272,63 +347,5 @@ class LineStyle:
         return cls(**tree)
 
 
-def k2t(kfile: str, tfile: str) -> None:
-    tree = ElementTree.parse(kfile)
-    root = tree.getroot()
-
-    assert root.tag == 'layer-properties'
-    name = None
-    entries = []
-    patterns = []
-    linestyles = []
-    for child in root:
-        if child.tag == 'custom-dither-pattern':
-            patterns.append(Pattern.from_xml(child))
-        elif child.tag == 'custom-line-style':
-            linestyles.append(LineStyle.from_xml(child))
-        elif child.tag == 'properties':
-            entries.append(Entry.from_xml(child))
-        elif child.tag == 'name':
-            name = child.text
-        else:
-            raise Exception(f'Unexpected tag: {child.tag}')
-
-    if name is not None:
-        print(f'Discarding tab name: {name}')
-
-    with open(tfile, 'wt') as ff:
-        for entry in entries:
-            ff.write(entry.to_toml())
-        for pattern in patterns:
-            ff.write(pattern.to_toml())
-        for linestyle in linestyles:
-            ff.write(linestyle.to_toml())
-
-
-def t2k(tfile: str, kfile: str) -> None:
-    root = ElementTree.Element('layer-properties')
-
-    with open(tfile, 'rb') as ff:
-        ttree = tomllib.load(ff)
-
-    entries = [Entry.from_toml(entry)
-               for entry in ttree['layers']]
-    patterns = [Pattern.from_toml(pat)
-                for pat in ttree['patterns']]
-    linestyles = [LineStyle.from_toml(ls)
-                  for ls in ttree['linestyles']]
-
-    for entry in entries:
-        root.append(entry.to_xml())
-    for pattern in patterns:
-        root.append(pattern.to_xml())
-    for linestyle in linestyles:
-        root.append(linestyle.to_xml())
-
-    ktree = ElementTree.ElementTree(root)
-    ElementTree.indent(ktree)
-    ktree.write(kfile)
-
-
 def toml_escape(string: str) -> str:
     return string.replace('\\', '\\\\').replace('"', '\\"')