diff --git a/spec/basis_spec.txt b/spec/basis_spec.txt
index 41be82d..73b448e 100644
--- a/spec/basis_spec.txt
+++ b/spec/basis_spec.txt
@@ -595,7 +595,11 @@ selector codebook indices are decoded.
     };
     block_preds block_endpoint_preds[2][num_blocks_x];
     
-    // State used during block decoding
+    // Some constants and state used during block decoding
+    const uint32_t SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX = selector_codebook_size;
+		const uint32_t SELECTOR_HISTORY_BUF_RLE_SYMBOL_INDEX = selector_history_buf_size + SELECTOR_HISTORY_BUF_FIRST_SYMBOL_INDEX;
+		uint32_t cur_selector_rle_count = 0;
+    
     uint32_t cur_pred_bits = 0;
     int prev_endpoint_pred_sym = 0;
     int endpoint_pred_repeat_count = 0;