diff --git a/pixelocr/gui/ocrengine.py b/pixelocr/document.py
similarity index 94%
rename from pixelocr/gui/ocrengine.py
rename to pixelocr/document.py
index 34b3e57..1fc97a6 100644
--- a/pixelocr/gui/ocrengine.py
+++ b/pixelocr/document.py
@@ -18,13 +18,13 @@ import itertools
 from glob import glob
 from os import path
 
-from .. import formatting
-from ..image import Image
-from ..page import Page, Space
-from ..glyphdb import GlyphDB, SPACE, NEWLINE
+from . import formatting
+from .image import Image
+from .page import Page, Space
+from .glyphdb import GlyphDB, SPACE, NEWLINE
 
 
-class OCREngine(object):
+class Document(object):
     SPACE_WIDTH = 15
 
     def __init__(self, dirname, ui, skip=0, limit=None, output_format='text'):
diff --git a/pixelocr/gui/__init__.py b/pixelocr/gui/__init__.py
index a659f7c..842f7c5 100644
--- a/pixelocr/gui/__init__.py
+++ b/pixelocr/gui/__init__.py
@@ -37,9 +37,9 @@ from PyQt4.QtGui import (
     QApplication,
 )
 
+from ..document import Document
 from .guiproxy import GUIProxy
 from .window import MainWindow
-from .ocrengine import OCREngine
 
 
 parser = ArgumentParser(description='PixelOCR')
@@ -58,13 +58,13 @@ def load_entry_point(group, name):
 
 
 class WorkerThread(QThread):
-    def __init__(self, ocr, quit=False):
+    def __init__(self, document, quit=False):
         super().__init__()
-        self.ocr = ocr
+        self.document = document
         self.quit = quit
 
     def run(self):
-        self.ocr.recognize()
+        self.document.recognize()
         if self.quit:
             qApp.quit()
 
@@ -77,20 +77,20 @@ def main():
 
     args = parser.parse_args()
     gui_proxy = GUIProxy()
-    ocr = OCREngine(
+    document = Document(
         args.filename,
         ui=gui_proxy,
         skip=args.skip,
         limit=args.limit,
         output_format=load_entry_point('pixelocr.formatting', args.output_format).load()(),
     )
-    app.aboutToQuit.connect(ocr.save_glyphdb)
-    ocr_thread = WorkerThread(ocr, quit=args.quit)
+    app.aboutToQuit.connect(document.save_glyphdb)
+    worker_thread = WorkerThread(document, quit=args.quit)
 
-    win = MainWindow(ocr)
+    win = MainWindow(document)
     win.glyphEntered.connect(gui_proxy.give_help)
     win.show()
-    ocr_thread.start()
+    worker_thread.start()
 
     signal.signal(signal.SIGINT, signal.SIG_DFL)
     sys.exit(app.exec_())
diff --git a/pixelocr/gui/window.py b/pixelocr/gui/window.py
index 798f3ec..e52727f 100644
--- a/pixelocr/gui/window.py
+++ b/pixelocr/gui/window.py
@@ -42,11 +42,11 @@ class MainWindow(QMainWindow):
     dbedit = None
     glyphEntered = signal([str, bool, bool])
 
-    def __init__(self, ocr):
+    def __init__(self, document):
         super().__init__()
         self.setDocumentTitle(None)
 
-        self.ocr = ocr
+        self.document = document
 
         centralWidget = QWidget(self)
         self.setCentralWidget(centralWidget)
@@ -54,14 +54,14 @@ class MainWindow(QMainWindow):
         self.page = PageView(self.pageScene, centralWidget)
         self.glyphEdit = GlyphEdit(centralWidget)
         self.glyphEdit.setEnabled(False)
-        self.glyphDBEdit = GlyphDBEdit(self.ocr.glyphdb)
+        self.glyphDBEdit = GlyphDBEdit(self.document.glyphdb)
 
         self.glyphEdit.glyphEntered.connect(self.unknownGlyphEntered)
         self.glyphEdit.glyphEntered.connect(self.pageScene.clearHighlight)
         self.glyphEdit.glyphEntered.connect(self.glyphDBEdit.updateData)
-        ocr.ui.pageChanged.connect(self.pageScene.setPage)
-        ocr.ui.pageChanged.connect(self.showPageTitle)
-        ocr.ui.unknownGlyph.connect(self.unknownGlyph)
+        document.ui.pageChanged.connect(self.pageScene.setPage)
+        document.ui.pageChanged.connect(self.showPageTitle)
+        document.ui.unknownGlyph.connect(self.unknownGlyph)
         self.page.setFocusProxy(self.glyphEdit)
 
         layout = QVBoxLayout(centralWidget)