Update 'README.md'

README.md

@@ -12,3 +12,29 @@ Generates a random string of words of given length using UNIX words file.
 ```
 lipsum <num words>
 ```
+
+## Explanation
+
+It is a somewhat verbose C implementation of the following python function:
+
+```python
+
+import os
+import random
+
+def lipsum(num_words):
+    if os.path.exists('/usr/share/dict/words'):
+        file_name = '/usr/share/dict/words'
+    elif os.path.exists('/usr/dict/words'):
+        file_name = '/usr/dict/words'
+    else:
+        return 1
+
+    with open(file_name, 'r') as word_file:
+        words = word_file.readlines()
+    for i in range(num_words):
+        print(words[random.randint(0, len(words))], end=' ')
+    return 0
+
+```
+