diff --git a/cucul/transform.c b/cucul/transform.c
index 390aa9d..a6e903e 100644
--- a/cucul/transform.c
+++ b/cucul/transform.c
@@ -274,8 +274,14 @@ static uint32_t flipchar(uint32_t ch)
          0x250f, 0x2513, /* ┏ ┓ */
          0x2517, 0x251b, /* ┗ ┛ */
          0x2523, 0x252b, /* ┣ ┫ */
+         0x2552, 0x2555, /* ╒ ╕ */
+         0x2558, 0x255b, /* ╘ ╛ */
+         0x2553, 0x2556, /* ╓ ╖ */
+         0x2559, 0x255c, /* ╙ ╜ */
          0x2554, 0x2557, /* ╔ ╗ */
          0x255a, 0x255d, /* ╚ ╝ */
+         0x255e, 0x2561, /* ╞ ╡ */
+         0x255f, 0x2562, /* ╟ ╢ */
          0x2560, 0x2563, /* ╠ ╣ */
          0x2574, 0x2576, /* ╴ ╶ */
          0x2578, 0x257a, /* ╸ ╺ */
@@ -360,6 +366,12 @@ static uint32_t flopchar(uint32_t ch)
          0x2554, 0x255a, /* ╔ ╚ */
          0x2557, 0x255d, /* ╗ ╝ */
          0x2566, 0x2569, /* ╦ ╩ */
+         0x2552, 0x2558, /* ╒ ╘ */
+         0x2555, 0x255b, /* ╕ ╛ */
+         0x2564, 0x2567, /* ╤ ╧ */
+         0x2553, 0x2559, /* ╓ ╙ */
+         0x2556, 0x255c, /* ╖ ╜ */
+         0x2565, 0x2568, /* ╥ ╨ */
          0x2575, 0x2577, /* ╵ ╷ */
          0x2579, 0x257b, /* ╹ ╻ */
          0
@@ -458,6 +470,14 @@ static uint32_t rotatechar(uint32_t ch)
          0x2557, 0x255a, /* ╗ ╚ */
          0x2560, 0x2563, /* ╠ ╣ */
          0x2566, 0x2569, /* ╦ ╩ */
+         0x2552, 0x255b, /* ╒ ╛ */
+         0x2555, 0x2558, /* ╕ ╘ */
+         0x255e, 0x2561, /* ╞ ╡ */
+         0x2564, 0x2567, /* ╤ ╧ */
+         0x2553, 0x255c, /* ╓ ╜ */
+         0x2556, 0x2559, /* ╖ ╙ */
+         0x255f, 0x2562, /* ╟ ╢ */
+         0x2565, 0x2568, /* ╥ ╨ */
          0x2574, 0x2576, /* ╴ ╶ */
          0x2575, 0x2577, /* ╵ ╷ */
          0x2578, 0x257a, /* ╸ ╺ */