Added comment mentioning only known bug. Minor.

src/keyboard/ergodox/layout/workman-p-kinesis-mod.c

@@ -6,7 +6,14 @@
 * Project located at <https://github.com/benblazak/ergodox-firmware>
 * -------------------------------------------------------------------------- */
 
-//TODO: use sticky keys like colemak-jc-mod.c ??
+// TODO: there is a bug where if you hit an inverted key and a normal key, at
+// the same time, when the 6 key buffer and modifier states are sent the
+// inverted key's shift state can be used for the non-inverted key.
+// Example: hit 1 and q at the same time in workman-p, you may end up with "1Q"
+// instead of "1q".  Not sure how to fix this at present, but it may require
+// sending two frames of updates to properly denote an order (shifted in one
+// update, unshifted added in another, as though shift was released).
+
 #include <stdint.h>
 #include <stddef.h>
 #include <avr/pgmspace.h>