diff --git a/src/hashtree.py b/src/hashtree.py
--- a/src/hashtree.py
+++ b/src/hashtree.py
@@ -1,6 +1,8 @@
 import hashlib
 import os
 
+from util import progress
+
 
 class HashTree:
 	HASH_LEN=16 # bytes
@@ -20,10 +22,13 @@ class HashTree:
 			size=stat.st_size # !! symlinks
 			leafCount=(size-1)//HashTree.BLOCK_SIZE+1 # number of leaf blocks
 			res=cls(leafCount)
+			print("hashing file:")
 
 			for i in range(leafCount):
 				data=f.read(HashTree.BLOCK_SIZE)
 				res.insertLeaf(hashlib.sha256(data).digest()[HashTree.HASH_LEN:])
+
+				progress(i, leafCount)
 		res.buildTree()
 		
 		return res
@@ -68,8 +73,10 @@ class HashTree:
 			
 	## Fast construction of the tree over the leaves. O(n).
 	def buildTree(self):
+		print("building tree:")
 		for i in range(self.leafStart-1,-1,-1):
 			self.store[i]=hashlib.sha256(self.store[i*2+1]+self.store[i*2+2]).digest()[HashTree.HASH_LEN:]
+			progress(i, -1, self.leafStart - 1)
 
 
 if __name__=="__main__":