diff --git a/pixelocr/glyphdb.py b/pixelocr/glyphdb.py
index e5be0c0..1dd5776 100644
--- a/pixelocr/glyphdb.py
+++ b/pixelocr/glyphdb.py
@@ -78,7 +78,7 @@ class GlyphDB(object):
         key = self._key_from_glyph(glyph)
         self._dict[key] = data
 
-    def update(self, data):
+    def add(self, data):
         key = self._key_from_data(data)
         self._dict[key] = data
 
@@ -99,7 +99,7 @@ class GlyphDB(object):
         with open(self.filename, 'rb') as fileobj:
             data = pickle.load(fileobj)
         for item in data:
-            self.update(GlyphData.deserialize(item))
+            self.add(GlyphData.deserialize(item))
 
     def save(self):
         data = [data.serialize() for data in self.values()]