diff --git a/pisi/build.py b/pisi/build.py
index 672f71bb..3c1a4c10 100644
--- a/pisi/build.py
+++ b/pisi/build.py
@@ -118,6 +118,7 @@ class BuildContext(object):
 
 class Builder:
     """Provides the package build and creation routines"""
+    #FIXME: this class and every other class must use URLs as paths!
     def __init__(self, pspec):
         self.bctx = BuildContext(pspec)
         self.pspecdir = os.path.dirname(os.path.realpath(self.bctx.pspecfile))