improve -c parsing and doc

1 files changed, 8 insertions, 4 deletions

diff --git a/uxd.rst b/uxd.rst
index eddbd4f..5ef598b 100644
--- a/uxd.rst
+++ b/uxd.rst
@@ -76,7 +76,7 @@ as *K*, *M*, and *G* for power-of-10 based (e.g. *1K* is 1000 bytes).
 .. bold color output.
 
 -c nnnnn
-  Set the colors to use. Must be 2 to 5 digits, from 0 to 7. These are
+  Set the colors to use. Must be 1 to 5 digits, from 0 to 7. These are
   standard ANSI colors:
 
   0
@@ -106,15 +106,19 @@ as *K*, *M*, and *G* for power-of-10 based (e.g. *1K* is 1000 bytes).
   The first 2 digits are the alternating colors for
   normal characters, the 3rd and 4th (optional) are the alternating colors for non-printable
   and space characters, and the 5th (optional) is for invalid UTF-8
-  sequences. Default: **23561**. This option also disables a prior **-m**
-  option.
+  sequences.
+
+  Default colors are **23561**. If fewer than 5 colors are supplied,
+  the remaining colors keep their default values.
 
   Note that the default color set doesn't include white or black:
   usually one of these is the terminal's background
   color. Also, it avoids blue, because blue text is hard to read on
   many terminals.
 
-.. colors (2 to 5 digits, 0 to 7).
+  This option also disables a prior **-m** option.
+
+.. colors (1 to 5 digits, 0 to 7).
 
 -d data
   Dump this data, instead of reading from a file or stdin. If *data*