diff --git a/server/drivers/IOWarrior.c b/server/drivers/IOWarrior.c
index e5b2356..a7e5222 100644
--- a/server/drivers/IOWarrior.c
+++ b/server/drivers/IOWarrior.c
@@ -800,9 +800,10 @@ IOWarrior_get_free_chars (Driver *drvthis)
 /*********************************************************************
  * API: Sets a custom character from 0 - (NUM_CCs-1)
  *
- * The API only permit setting to off=0 and on<>0
- * For input is just an array of characters:
- *  values > 0 mean "on" and values <= 0 are "off".
+ * The input is an array of bytes, each representing a pixel row
+ * starting from the top to bottom.
+ * The bits in each byte represent the pixels where the LSB
+ * (least significant bit) is the rightmost pixel in each pixel row
  */
 MODULE_EXPORT void
 IOWarrior_set_char(Driver *drvthis, int n, unsigned char *dat)
diff --git a/server/drivers/IOWarrior.h b/server/drivers/IOWarrior.h
index accbbe7..9e9207e 100644
--- a/server/drivers/IOWarrior.h
+++ b/server/drivers/IOWarrior.h
@@ -63,7 +63,8 @@ typedef enum {
   vbar,		/* vertical bars */
   hbar,		/* horizontaln bars */
   bignum,	/* big numbers */
-  bigchar	/* big characters */
+  bigchar,	/* big characters */
+  custom	/* custom icons */
 } CGmode;