cxrefbas: update doc.

1 files changed, 30 insertions, 2 deletions

diff --git a/cxrefbas.rst b/cxrefbas.rst
index 62346cd..50c4dbc 100644
--- a/cxrefbas.rst
+++ b/cxrefbas.rst
@@ -18,8 +18,8 @@ DESCRIPTION
 
 **cxrefbas** reads an Atari 8-bit BASIC tokenized program. For each
 line number in the program, it prints a list of lines that reference
-it. Each reference is followed by a letter that indicates the type
-of reference:
+it. Each line number reference is followed by a letter that indicates
+the type of reference:
 
 **G**
   *GOTO* (without *ON*) or *GO TO*.
@@ -63,6 +63,34 @@ General Options
   Verbose operation. When displaying a number in verbose mode, it will
   be prefixed with *$* if it's in hex, or no prefix for decimal.
 
+EXAMPLE
+=======
+
+This program::
+
+  10 GOSUB 100:GOSUB 200
+  100 RESTORE 1000:IF A THEN 120
+  110 GOTO 200
+  120 ON B GOTO 300,310,320
+  200 RETURN
+  300 PRINT 1
+  310 PRINT 2
+  1000 DATA XYZ
+
+Produces this output::
+
+  100: 10:S 
+  120: 100:I 
+  200: 10:S 110:G 
+  300: 120:O 
+  310: 120:O 
+  !320: 120:O 
+  1000: 100:R 
+
+Note that line 320 doesn't exist in the program, so it's shown with
+*!* in the output. Line 120 has *100:I*; if the *THEN 120* were
+changed to *THEN GOTO 120*, line 120 would read *100:G*.
+
 EXIT STATUS
 ===========