Updated README with basic usage.

1 files changed, 17 insertions, 0 deletions

diff --git a/README b/README
index 2b50232..7beedac 100644
--- a/README
+++ b/README
@@ -2,3 +2,20 @@ codeword is released under the GPL v3.  See LICENSE for details.
 
 words_alpha.txt is released into the public domain.  The original source and
 license is available at https://github.com/dwyl/english-words.
+
+To use codeword, run it with a text file containing a list of words and a
+series of arguments that define whether each character position is a missing
+letter (using period), a numbered letter or a fixed letter.
+
+For instance:
+
+    codeword words_alpha.txt 1 2 w 2
+
+To search for a four letter word where 'w' is the third character, the first
+charater is a different letter, and the same different letter is used in the
+second and fourth character position.
+
+    codeword words_alpha.txt . . w .
+
+To search for a four letter where the third character is 'w' and all other
+characters can be any letter.