diff --git a/HowItWorks.md b/HowItWorks.md
index 70cdb30..b7f468d 100644
--- a/HowItWorks.md
+++ b/HowItWorks.md
@@ -154,3 +154,54 @@ directives.  For example:
     .endif
 
 .else if also available.  .ifdefs can be nested.
+
+Obsolete feature: sync lines
+----------------------------
+
+the sync lines specification no longer matter.  We now always parse
+from the beginning of the file.  Here is the old description:
+
+Define no. sync lines
+You can say:
+\-200     means 200 lines
+\-        means always start parsing from beginning of file when we lose sync
+          if nothing is specified, the default is -50
+
+Colors and attributes
+---------------------
+
+Define colors and attributes.  Give a list of attributes, one
+background color and one foreground color (default is used if
+color is left out).
+
+Attributes:
+  bold inverse blink dim underline
+
+Standard colors:
+
+Foreground:
+  white cyan magenta blue yellow green red black
+
+Background:
+  bg_white bg_cyan bg_magenta bg_blue bg_yellow bg_green bg_red bg_black
+
+For 16 color and 256 color xterms: "export TERM=xterm-16color", these
+brighter than normal colors are available:
+
+> Note that you need an xterm which was compiled to support 16 or 256 colors
+> and a matching termcap/terminfo entry for it.
+
+Foreground:
+  WHITE CYAN MAGENTA BLUE YELLOW GREEN RED BLACK
+
+Background:
+  bg_WHITE bg_CYAN bg_MAGENTA bg_BLUE bg_YELLOW bg_GREEN bg_RED bg_BLACK
+
+For 256 color xterm: "export TERM=xterm-256color", these become available:
+
+> Note that you need an xterm which was compiled to support 256 colors and a
+> matching termcap/terminfo entry for it.
+
+fg_RGB and bg_RGB, where R, G, and B range from 0 - 5.  So: fg_500 is bright red.
+
+fg_NN and bg_NN give shades of grey, where the intensity, NN, ranges from 0 - 23.