diff --git a/changelog.txt b/changelog.txt
index 7c1fd106..66b7e404 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -4797,6 +4797,8 @@ Menu improvements:
 - tile-type display no longer assigns different colors depending on football type
 - when editing color tables, it is now possible to add more colors
 - Crystal World and Snake Nest were legal in some tilings but they did not actually appear -- should be fixed
-- ystrafe no longer brings walking eye level below 0
+- vertical strafe in walkingmode no longer brings eye level below 0
 
-TODO mirror with no-unmirror
+2022-10-08 02:14 Update 12.c:
+- some improvements to tes file support. Mirrored tiles should now work for apeirogons. Valence check and thus football colorability should now work with affine/star tessellations. 
+- also included more tes samples
diff --git a/hyper.h b/hyper.h
index 3426b4a1..79ff307e 100644
--- a/hyper.h
+++ b/hyper.h
@@ -13,8 +13,8 @@
 #define _HYPER_H_
 
 // version numbers
-#define VER "12.1b"
-#define VERNUM_HEX 0xA922
+#define VER "12.1c"
+#define VERNUM_HEX 0xA923
 
 #include "sysconfig.h"