diff --git a/src/diana/sgfparser/node.py b/src/diana/sgfparser/node.py
--- a/src/diana/sgfparser/node.py
+++ b/src/diana/sgfparser/node.py
@@ -86,8 +86,8 @@ class Node:
 			return res
 		return None
 
-	## Create a copy of the Node, with the same parent and deep copied properties, no copied children.
 	def copy(self):
+		"""Create a copy of the Node, with the same parent and deep copied properties, no copied children."""
 		res = Node()
 		res.properties = {k: v.copy() for (k, v) in self.properties.items()}
 		res.parent = self.parent
@@ -99,8 +99,8 @@ class Node:
 		else:
 			return default
 
-	## Returns textual representation of the Node itself, but disregards its children.
 	def __str__(self):
+		"""Returns textual representation of the Node itself, but disregards its children."""
 		return ";" + "".join(str(p) for p in self.properties.values())
 
 	def export(self):