update man page

1 files changed, 18 insertions, 15 deletions

diff --git a/uxd.rst b/uxd.rst
index 6069e4e..7e35440 100644
--- a/uxd.rst
+++ b/uxd.rst
@@ -260,13 +260,13 @@ changed with the **-c** option (see above).
 **green**, **yellow**
   Printable characters (except the space, U+0020) alternate between green and yellow.
 
-**purple**
+**purple**, **cyan**
   Spaces and unprintable characters ("control" characters, newlines,
-  tabs, etc).  These are printed as "visible" characters, e.g. ␣ for
-  the space, ↵ for a newline.  Hopefully this is an improvement over
-  the usual practice of printing these as periods, like standard hex
-  dumpers do. The Unicode BOM (byte order marker, U+FEFF) is printed
-  as a purple letter B.
+  tabs, etc) alternate between purple and cyan. These are printed as
+  "visible" characters, e.g. ␣ for the space, ↵ for a newline.
+  Hopefully this is an improvement over the usual practice of printing
+  these as periods, like standard hex dumpers do. The Unicode BOM
+  (byte order marker, U+FEFF) is printed as a purple letter B.
 
 **red**
   Invalid UTF-8 sequences. These are rendered as � (U+0FFD) with
@@ -274,11 +274,14 @@ changed with the **-c** option (see above).
   sequences are:
 
     - Prefix bytes (>= 0x80) which are not followed by the correct number of continuation
-      bytes (with their high 2 bits set to **10**). Rendered as **�**.
+      bytes (with their high 2 bits set to **10**).
 
-    - Continuation bytes that aren't preceded by a valid prefix byte. Rendered as **�**.
+    - Continuation bytes that aren't preceded by a valid prefix byte.
 
-    - Truncated UTF-8 sequence at EOF. Rendered as **�**.
+    - Truncated UTF-8 sequence at EOF.
+
+  Also, there are sequences that are valid UTF-8 encodings, but not valid Unicode.
+  These are normally rendered with a red background.
 
     - UTF-16 surrogates (codepoints U+D800 to U+DFFF) [**\***]. Rendered as **S**.
 
@@ -288,12 +291,12 @@ changed with the **-c** option (see above).
     - Overlong encodings (e.g. codepoints U+0000 to U+007F encoded
       as 2 or more bytes) [**\***]. Rendered as **O**.
 
-    For items marked with [**\***], the **-j**, **-p**, and/or **-w**
-    options can disable error highlighting for this type of error. They
-    will be displayed in purple rather than red.
+  Each error-highlighted sequence will increment the "Bad
+  sequences" count, if the **-i** option is used.
 
-    Each error-highlighted sequence will increment the "Bad
-    sequences" count, if the **-i** option is used.
+  For items marked with [**\***], the **-j**, **-p**, and/or **-w**
+  options can disable error highlighting for this type of error. They
+  will be displayed in purple or cyan rather than red.
 
 TERMINAL SUPPORT
 ================
@@ -313,7 +316,7 @@ Known **not** to work: rxvt (doesn't support Unicode at all), and its
 derivatives such as aterm.
 
 **uxd** also builds and runs correctly on a Mac running a recent
-version of OSX (though I'm not sure what terminal was used).
+version of OSX with Terminal.app.
 
 FONTS
 =====