Update README.md

README.md

@@ -24,23 +24,53 @@ Then in a psql session issue:
     CREATE extension pg_hashids;
 
 
+Update
+============
+
+Install as usual.
+
+    make; sudo make install
+
+Then in a psql session issue:
+
+    ALTER EXTENSION pg_hashids UPDATE;
+
+or
+
+    DROP EXTENSION pg_hashids;
+    CREATE EXTENSION pg_hashids;
+
+Check
+
+    SELECT default_version, installed_version FROM pg_available_extensions WHERE name = 'pg_hashids';
+
+
 Usage
 ============
 #### Encoding
 Returns a hash using the default `alphabet` and empty `salt`.
 
-	SELECT hash_encode(1001); -- Result: jNl
+	SELECT id_encode(1001); -- Result: jNl
 
 Returns a hash using the default `alphabet` and supplied `salt`.
 
-	SELECT hash_encode(1234567, 'This is my salt'); -- Result: Pdzxp
+	SELECT id_encode(1234567, 'This is my salt'); -- Result: Pdzxp
 
 Returns a hash using the default `alphabet`, `salt` and minimum hash length.
 
-	SELECT hash_encode(1234567, 'This is my salt', 10); -- Result: PlRPdzxpR7
+	SELECT id_encode(1234567, 'This is my salt', 10); -- Result: PlRPdzxpR7
+
+
+Returns a hash using the supplied `alphabet`, `salt` and minimum hash length.
+
+	SELECT id_encode(1234567, 'This is my salt', 10, 'abcdefghijABCDxFGHIJ1234567890'); -- Result: 3GJ956J9B9
 
 #### Decoding
 You can also decode previouslt generated hashes. Just use the same `salt`, otherwise you'll get wrong results.
 
-	SELECT hash_decode('PlRPdzxpR7', 'This is my salt', 10);
+	SELECT id_decode('PlRPdzxpR7', 'This is my salt', 10); -- Result: 1234567
+
+Using a custom alphabet
+
+	SELECT id_decode('3GJ956J9B9', 'This is my salt', 10, 'abcdefghijABCDxFGHIJ1234567890'); -- Result: 1234567