--- a/tools/gfxconv.c	Fri Jun 14 06:07:35 2019 +0300
+++ b/tools/gfxconv.c	Fri Jun 14 07:40:24 2019 +0300
@@ -262,13 +262,15 @@
     "\n"
     "Color index mapping (-m)\n"
     "------------------------\n"
-    "Color mapping definitions are used for ANSI and image output, to declare what\n"
-    "output colors of the C64 palette are used for each single color/multi color\n"
-    "bit-combination. For example, if the input is multi color sprite or char,\n"
-    "you can define colors like: -m 0,8,3,15 .. for single color: -m 0,1\n"
+    "Color index map definitions are used for sprite/char data input (and ANSI\n"
+    "output), to set what colors of the C64 palette are used for each single\n"
+    "color/multi color bit-combination.\n"
+    "For example, if the input is multi color sprite or char, you can define\n"
+    "colors like: -m 0,8,3,15 .. for hires/single color: -m 0,1\n"
     "The numbers are palette indexes, and the order is for bit(pair)-values\n"
     "00, 01, 10, 11 (multi color) and 0, 1 (single color). NOTICE! 255 is the\n"
-    "special transparency color index.\n"
+    "special transparency color index; -m 255,2 would use transparency for\n"
+    "'0' bits and and C64 color 2 for '1' bits.\n"
     "\n"
     );
 }