diff --git a/developer-handbook.md b/developer-handbook.md
index 67a798ff..332d1d35 100644
--- a/developer-handbook.md
+++ b/developer-handbook.md
@@ -26,6 +26,8 @@ All components have a platform indicator next to them:
     * glfw - GLFW implementation (P-)
     * userland - common things needed by all non-bare-metal implementations (P-)
     * studio - studio plugin for core (P-)
+  * geo - geometry types (PG)
+  * glutils - OpenGL helpers (P-)
   * player - plays the games (PG)
   * studio - makes the games (P-)
   * tools - command line tools (P-)