docs

Readme.md

@@ -37,6 +37,22 @@
   `mad(1)` pipes to `less(1)` so you get the same paging / searching
   goodness that you expect from `man(1)`.
 
+## Page lookup
+
+  Use the __MAD_PATH__ environment variable to control
+  where `mad(1)` will look for a manual page.
+  The ".md" extension may be omitted.
+
+  For example:
+
+    MAD_PATH="/usr/share/mad:share/mad"
+
+  The following paths will always be searched:
+
+     - .
+     - /usr/local/share/mad
+     - /usr/share/mad
+
 ## Screenshots
 
   Jade manual: