can not find "fc_conv_padding" parameter in function vgg.vgg_16

[ghost]

when i read the code fcn_32s.py , i find that it called function vgg.vgg_16 and passing into a parameter called fc_conv_padding="SAME".
logits, end_points = vgg.vgg_16(mean_centered_image_batch,
num_classes=number_of_classes,
is_training=is_training,
spatial_squeeze=False,
fc_conv_padding='SAME')

However, when I turn to the vgg.vgg_16, i can not find this parameter.

def vgg_16(inputs,
num_classes=1000,
is_training=True,
dropout_keep_prob=0.5,
spatial_squeeze=True,
scope='vgg_16'):

[ghost]

you can actually remove fc_conv_padding='SAME' because, in definition of vgg.vgg_16, the argument for slim.conv2d is already included ( padding='VALID')