diff --git a/README.md b/README.md
index 21702b4..e981b6d 100644
--- a/README.md
+++ b/README.md
@@ -13,11 +13,22 @@ Join chat on Matrix at [#panorama:mozilla.org][3]
 
 Goals:
 
-- Never have to actually close the application.
-- Handles email, calendar, and address books using open standards.
-- Hot-reload on-disk config.
+- **Never have to actually close the application.** All errors should be
+  handled gracefully in a way that can be recovered or restarted without
+  needing to close the entire application.
+- **Handles email, calendar, and address books using open standards.** IMAP for
+  email retrieval, SMTP for email sending, CalDAV for calendars, and CardDAV
+  for address books. Work should be saved locally prior to uploading to make
+  sure nothing is ever lost as a result of network failure.
+- **Hot-reload on-disk config.** Configuration should be able to be reloaded so
+  that the user can keep the application open. Errors in config should be
+  reported to the user while the application is still running off the old
+  version.
+- **Scriptable.** Built-in scripting language should allow for customization of
+  common functionality, including keybinds and colors.
 
 Stretch goals:
+- Full-text email/message search
 - Unified "feed" that any app can submit to.
 - Submit notifications to gotify-shaped notification servers.
 - JMAP implementation.
diff --git a/docs/src/SUMMARY.md b/docs/src/SUMMARY.md
index 415ddc2..1426363 100644
--- a/docs/src/SUMMARY.md
+++ b/docs/src/SUMMARY.md
@@ -2,3 +2,4 @@
 
 - [Intro](./intro.md)
 - [Config](./config.md)
+- [Code Structure](./code.md)
diff --git a/docs/src/code.md b/docs/src/code.md
new file mode 100644
index 0000000..9482896
--- /dev/null
+++ b/docs/src/code.md
@@ -0,0 +1,26 @@
+# Code Structure
+
+The entire application is running on several async threads in a tokio runtime:
+
+- [Mail](#mail)
+- [UI](#ui)
+- [VM](#vm)
+
+Each of these communicates with the others via pairs of unbounded async
+channels.
+
+## Mail
+
+The mail thread is in charge of communicating with mail servers. It keeps a
+single connection alive to each server even if the UI thread has multiple mail
+views open.
+
+## UI
+
+The UI thread manages everything user-facing. It runs a terminal UI using the
+tui crate. There's a tiny windowing system built in that allows for tiling
+windows, split horizontally or vertically.
+
+## VM
+
+The VM runs the scripting language that can be used inside the application.
diff --git a/src/ui/mod.rs b/src/ui/mod.rs
index 3bb842a..9f90f76 100644
--- a/src/ui/mod.rs
+++ b/src/ui/mod.rs
@@ -151,7 +151,6 @@ impl UI {
         let visible = self.window_layout.visible_windows(chunks[0]);
         for (layout_id, area) in visible.into_iter() {
             if let Some(window) = self.windows.get(&layout_id) {
-                debug!("drawing window {:?}", window.name());
                 window.draw(f, area, self);
             }
         }