diff --git a/jieba/lac_small/reader_small.py b/jieba/lac_small/reader_small.py
index 8693e16..a970188 100755
--- a/jieba/lac_small/reader_small.py
+++ b/jieba/lac_small/reader_small.py
@@ -64,7 +64,7 @@ class Dataset(object):
     
     @property
     def vocab_size(self):
-        """vocabuary size"""
+        """vocabulary size"""
         return max(self.word2id_dict.values()) + 1
     
     @property
@@ -97,4 +97,4 @@ class Dataset(object):
         word_ids = self.word_to_ids(words)
         return word_ids
     
-   
\ No newline at end of file
+