diff --git a/Lib/io.py b/Lib/io.py
index 3fcab6b..3914c9f 100644
--- a/Lib/io.py
+++ b/Lib/io.py
@@ -636,7 +636,7 @@
         """Read n bytes.
 
         Returns exactly n bytes of data unless the underlying raw IO
-        stream reaches EOF of if the call would block in non-blocking
+        stream reaches EOF or if the call would block in non-blocking
         mode. If n is negative, read until EOF or until read() would
         block.
         """
@@ -647,6 +647,7 @@
             to_read = max(self.buffer_size,
                           n if n is not None else 2*len(self._read_buf))
             current = self.raw.read(to_read)
+            print(to_read, repr(current))
             if current in (b"", None):
                 nodata_val = current
                 break