diff --git a/src/crab/thumb/long_branch_link.cr b/src/crab/thumb/long_branch_link.cr
new file mode 100644
index 0000000..455940b
--- /dev/null
+++ b/src/crab/thumb/long_branch_link.cr
@@ -0,0 +1,13 @@
+module THUMB
+  def thumb_long_branch_link(instr : Word) : Nil
+    second_instr = bit?(instr, 11)
+    offset = bits(instr, 0..10)
+    if second_instr
+      @r[14] &+= (offset << 1)
+      @r[15], @r[14] = @r[14], @r[15] - 1
+      clear_pipeline
+    else
+      @r[14] = (offset << 12) + @r[15]
+    end
+  end
+end
diff --git a/src/crab/thumb/thumb.cr b/src/crab/thumb/thumb.cr
index cceb1d2..4ac6a1d 100644
--- a/src/crab/thumb/thumb.cr
+++ b/src/crab/thumb/thumb.cr
@@ -7,7 +7,7 @@ module THUMB
     lut = Slice(Proc(Word, Nil)).new 256, ->thumb_unimplemented(Word)
     256.times do |idx|
       if idx & 0b11110000 == 0b11110000
-        # long branch with link
+        lut[idx] = ->thumb_long_branch_link(Word)
       elsif idx & 0b11111000 == 0b11100000
         # unconditional branch
       elsif idx & 0b11111111 == 0b11011111