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diff --git a/lib/skyline.py b/lib/skyline.py
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+"""
+skyline -- Manage outlines on the sky
+
+This module provides support for working with footprints on the sky.
+Primary use case would use the following generalized steps::
+
+1. Initialize SkyLine objects for each input image. This object would be the 
+    union of all the input image's individual chips WCS footprints.
+2. Determine overlap between all images. The determination would employ a 
+    recursive operation to return the extended list of all overlap values 
+    computed as [img1 vs [img2,img3,...,imgN],img2 vs [img3,...,imgN],...]
+3. Select the pair with the largest overlap, or the pair which produces the 
+    largest overlap with the first input image. This defines the initial 
+    reference SkyLine object.
+4. Perform some operation on the 2 images: for example, match sky in intersecting
+    regions, or aligning second image with the first (reference) image.
+5. Update the second image, either apply the sky value or correct the WCS, then 
+    generate a new SkyLine object for that image.
+6. Create a new reference SkyLine object as the union of the initial reference
+    object and the newly updated SkyLine object.
+7. Repeat Steps 2-6 for all remaining input images.
+
+This process will work reasonably fast as most operations are performed using
+the SkyLine objects and WCS information solely, not image data itself.
+"""
+import pyfits
+
+import sphere
+
+class SkyLine(object):
+    def __init__(self,fname):
+        pass
+        
+    def add_image(self,skyline):
+        pass
+    
+    def compute_overlap(self, skyline):
+        pass
+    
+    def find_intersection(self, skyline):
+        pass
+    
+    def within(self, pos):
+        pass
+    
+    def create_wcs(self):
+        pass
+