diff --git a/mutagen/wave.py b/mutagen/wave.py
index a38c3399..8c0dbbc8 100644
--- a/mutagen/wave.py
+++ b/mutagen/wave.py
@@ -232,7 +232,10 @@ def __init__(self, fileobj):
 
         data = waveFormatChunk.read()
 
-        info = struct.unpack('<hhLLhh', data[:16]) # Ref: https://docs.python.org/2/library/struct.html#byte-order-size-and-alignment
+        #
+        # RIFF: http://soundfile.sapp.org/doc/WaveFormat/
+        # Python struct.unpack: https://docs.python.org/2/library/struct.html#byte-order-size-and-alignment
+        info = struct.unpack('<hhLLhh', data[:16])
         self.audioFormat, self.channels, self.sample_rate, byte_rate, block_align, self.sample_size = info
         self.bitrate = self.channels * block_align * self.sample_rate