diff --git a/cuburn/code/iter.py b/cuburn/code/iter.py
index 5e9370f..42b9b2a 100644
--- a/cuburn/code/iter.py
+++ b/cuburn/code/iter.py
@@ -7,7 +7,7 @@ import interp
 from util import Template, devlib, ringbuflib
 from mwc import mwclib
 
-import cuburn.genome.spec
+import cuburn.genome.specs
 
 def precalc_densities(cp):
     # This pattern recurs a few times for precalc segments. Unfortunately,
@@ -417,7 +417,7 @@ def iter_body(cp):
 
 def mkiterlib(gnm):
     packer = interp.GenomePacker('iter_params', 'params',
-                                 cuburn.genome.spec.anim)
+                                 cuburn.genome.specs.anim)
     cp = packer.view(gnm)
 
     iterbody = iter_body(cp)
diff --git a/cuburn/genome/blend.py b/cuburn/genome/blend.py
index 46671fc..6abd1d8 100644
--- a/cuburn/genome/blend.py
+++ b/cuburn/genome/blend.py
@@ -36,14 +36,14 @@ def blend(src, dst, edit={}):
     for d in src, dst, edit:
         opts.update(d.get('blend', {}))
 
-    blended = merge_nodes(spec.node, src, dst, edit, opts['nloops'])
+    blended = merge_nodes(specs.node, src, dst, edit, opts['nloops'])
     name_map = sort_xforms(src['xforms'], dst['xforms'], opts['xform_sort'],
                            explicit=zip(*opts.get('xform_map', [])))
 
     blended['xforms'] = {}
     for (sxf_key, dxf_key) in name_map:
         bxf_key = (sxf_key or 'pad') + '_' + (dxf_key or 'pad')
-        xf_edits = merge_edits(spec.xform,
+        xf_edits = merge_edits(specs.xform,
                 get(edit, {}, 'xforms', 'src', sxf_key),
                 get(edit, {}, 'xforms', 'dst', dxf_key))
         blended['xforms'][bxf_key] = blend_xform(
@@ -65,7 +65,7 @@ def merge_edits(sv, av, bv):
     """
     Merge the values of ``av`` and ``bv`` according to the spec ``sv``.
     """
-    if isinstance(spec, (dict, spectypes.Map)):
+    if isinstance(sv, (dict, spectypes.Map)):
         av, bv = av or {}, bv or {}
         getsv = lambda k: sv.type if isinstance(sv, spectypes.Map) else sv[k]
         return dict([(k, merge_edits(getsv(k), av.get(k), bv.get(k)))
@@ -142,7 +142,7 @@ def blend_xform(sxf, dxf, edits, loops, isfinal=False):
         sxf = padding_xform(dxf, isfinal)
     if dxf is None:
         dxf = padding_xform(sxf, isfinal)
-    return merge_nodes(spec.xform, sxf, dxf, edits, loops)
+    return merge_nodes(specs.xform, sxf, dxf, edits, loops)
 
 # If xin contains any of these, use the inverse identity
 hole_variations = ('spherical ngon julian juliascope polar '
diff --git a/cuburn/genome/spec.py b/cuburn/genome/specs.py
similarity index 100%
rename from cuburn/genome/spec.py
rename to cuburn/genome/specs.py
diff --git a/cuburn/genome/use.py b/cuburn/genome/use.py
index 4aa6f58..d078166 100644
--- a/cuburn/genome/use.py
+++ b/cuburn/genome/use.py
@@ -1,7 +1,7 @@
 import numpy as np
 
 from spectypes import Spline, Scalar, RefScalar, Map, List, TypedList
-from spec import toplevels
+from specs import toplevels
 
 class Wrapper(object):
     def __init__(self, val, spec=None, path=()):