Update basis_spec.txt
diff --git a/spec/basis_spec.txt b/spec/basis_spec.txt
index c93a54d..3b8ad83 100644
--- a/spec/basis_spec.txt
+++ b/spec/basis_spec.txt
@@ -563,7 +563,7 @@
each) information. This is all the information needed to fully represent the
texels within each block.
-The decoding procedural loops over all the blocks in raster order, and decodes
+The decoding procedure loops over all the blocks in raster order, and decodes
the endpoint and selector indices used to represent each block. The decoding
procedural is complex enough that commented code is best used to describe it.
