diff --git a/data/languages/xtensaTodo.sinc b/data/languages/xtensaTodo.sinc
index 15f87a9..ba760ca 100644
--- a/data/languages/xtensaTodo.sinc
+++ b/data/languages/xtensaTodo.sinc
@@ -35,8 +35,8 @@
 
 # ENTRY - Subroutine Entry, pg. 340.
 :entry as, u15_12.23_sb3 is u15_12.23_sb3 & as & u2_6.7 = 0b00 & u2_4.5 = 0b11 & op0 = 0b0110 {
-# as normally a1
-#    a1 = a1 - u15_12.23_sb3;
+    local amn = sext(u15_12.23_sb3);
+    as = as - amn;
 }
 
 #    if (u15_12.23_sb3 ==4)