Bug: WMS Group Layer description is blank in the Layer Properties dialog General Tab
A WMS service may contain abstracts describing layers, group layers and sublayers. In ArcMap, abstracts for WMS layers and sublayers are displayed in the Description text box of the Layer Properties General Tab. For group layers (layers that group multiple WMS sublayers together), abstracts are not displayed in the description.
ArcMap does not recognize group layer abstracts provided by WMS servers.
WMS group layer abstracts can be viewed via the ArcCatalog Service Properties dialog box, the Layer tab in the ArcMap Layer Properties dialog box, or the WMS service capabilities file.
<a href='http://support.esri.com/en/knowledgebase/techarticles/detail/27948' target='_blank'>How To: View the WMS service capabilities</a>