diff --git a/disassembler/disassembler_mips.cc b/disassembler/disassembler_mips.cc
index 4787395..cc5b7f7 100644
--- a/disassembler/disassembler_mips.cc
+++ b/disassembler/disassembler_mips.cc
@@ -137,6 +137,8 @@
   { kSpecial0Mask | (0x1f << 16) | 0x7ff, (0x01 << 6) | 0x11, "clo", "DS" },
   { kSpecial0Mask | (0x1f << 16) | 0x7ff, (0x01 << 6) | 0x12, "dclz", "DS" },
   { kSpecial0Mask | (0x1f << 16) | 0x7ff, (0x01 << 6) | 0x13, "dclo", "DS" },
+  { kSpecial0Mask | 0x73f, 0x05, "lsa", "DSTj" },
+  { kSpecial0Mask | 0x73f, 0x15, "dlsa", "DSTj" },
   // TODO: sdbbp
 
   // SPECIAL2
@@ -487,6 +489,9 @@
           case 'i':  // Sign-extended lower 16-bit immediate.
             args << static_cast<int16_t>(instruction & 0xffff);
             break;
+          case 'j':  // sa value for lsa/dlsa.
+            args << (sa + 1);
+            break;
           case 'L':  // Jump label.
             {
               // TODO: is this right?