Update README.md

README.md

@@ -83,6 +83,19 @@ tokens = (token for paragraph in document.paragraphs()
     for token in sentence.tokens())
 ```
 
+To avoid loading large CCL documents to RAM (DOM parsers) we can read them
+iteratively, chunk by chunk, or sentence by sentence (SAX-based approach):
+
+```python
+it = read_chunks_it(ccl_path)
+for paragraph in it:
+    pass
+    
+it = read_sentences_it(ccl_path)
+for sentence in it:
+    pass
+```
+
 Token manipulation
 ==================