Update basis_spec.txt
diff --git a/spec/basis_spec.txt b/spec/basis_spec.txt
index 3b8ad83..37b5174 100644
--- a/spec/basis_spec.txt
+++ b/spec/basis_spec.txt
@@ -821,6 +821,6 @@
// Make sure they are valid
assert((endpoint_index < endpoints.size()) && (selector_index < selectors.size()));
-At this point, the decoder has both an endpoint and selector codebook indices.
-It can now fetch the endpoints/selectors from the codebooks and write out ETC1S
+At this point, the decoder has decoded each block's endpoint and selector codebook indices.
+It can now fetch the actual ETC1S endpoints/selectors from the codebooks and write out ETC1S
texture data, or it can transcode the ETC1S data to another texture format.
