diff --git a/GUI-Page.md b/GUI.md
similarity index 56%
rename from GUI-Page.md
rename to GUI.md
index b72a497..9951abb 100644
--- a/GUI-Page.md
+++ b/GUI.md
@@ -1,9 +1,11 @@
-# Giti UI Page
+# GUI - Giti User Interface
 
-## ID
+## Page
+
+### ID
 - To have canonical page IDs calculate it from hash of URN.
-- ID is first 64bit of SHA-512 hash of page URN!
+- ID is first 64bit of SHA3-256 hash of page URN!
 - Zero ID means no page!
 
-## URN
+### URN
 `urn:giti:{{domain-name}}:page:{{page-name}}`