diff --git a/pyembroidery/U01Reader.py b/pyembroidery/U01Reader.py
index 93b44537..6e4e3683 100644
--- a/pyembroidery/U01Reader.py
+++ b/pyembroidery/U01Reader.py
@@ -16,34 +16,57 @@ def read_u01_stitches(f, out):
         if (ctrl & 0x40) != 0:
             dy = -dy
         command = ctrl & 0b11111
-        #print(str(count), " ", str("{0:b}").format(ctrl), " 0x%0.2X " % ctrl, str(command), " " + str(dx), " ", str(dy))
+        # print(str(count), " ", str("{0:b}").format(ctrl), " 0x%0.2X " % ctrl, str(command), " " + str(dx), " ", str(dy))
         if command == 0x0:
+            # Stitch
             out.stitch(dx, dy)
             continue
-        if command == 0x1:
+        if command == 0x01:
+            # Jump
             out.move(dx, dy)
             continue
-        if command == 0x2:
+        if command == 0x02:
+            # Fast
             out.add_stitch_relative(FAST)
             if dx != 0 or dy != 0:
                 out.stitch(dx, dy)
             continue
-        if command == 0x4:
+        if command == 0x03:
+            # Fast, Jump
+            out.add_stitch_relative(FAST)
+            if dx != 0 or dy != 0:
+                out.move(dx, dy)
+            continue
+        if command == 0x04:
+            # Slow
             out.add_stitch_relative(SLOW)
             if dx != 0 or dy != 0:
                 out.stitch(dx, dy)
             continue
-        if command == 0x7:
+        if command == 0x05:
+            # Slow, Jump
+            out.add_stitch_relative(SLOW)
+            if dx != 0 or dy != 0:
+                out.move(dx, dy)
+            continue
+        if command == 0x06:
+            # T1 Top Thread Trimming, TTrim.
+            out.trim(dx, dy)
+            continue
+        if command == 0x07:
+            # T2 Bobbin Threading
             out.trim(dx, dy)
             continue
-        if command == 0x8:  # ww, stop file had proper A8 rather than E8 and displacement
+        if command == 0x08:  # ww, stop file had proper A8 rather than E8 and displacement
+            # C00 Stop
             out.stop(dx, dy)
             continue
-        if 0xE9 <= ctrl <= 0xEF:
+        if 0x09 <= command <= 0x17:
+            # C01 - C14
             if count > 1:
                 out.color_change(dx, dy)
             continue
-        if ctrl == 0xF8:
+        if command == 0x18:
             break
         break  # Uncaught Command
     out.end()