diff --git a/CHANGELOG.md b/CHANGELOG.md
index 802aa0b..4bb6d12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,7 +12,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Initial release
 - Lightbulb sign when LSP code actions are available on current line
 - Async LSP requests with generation-counter stale-response handling
-- Configurable sign text, highlight group, and extmark priority
+- Configurable sign text and highlight group
 - Zero-config auto-loading via `plugin/` directory
 
 [0.1.0]: https://github.com/swaits/tiny-lightbulb.nvim/releases/tag/v0.1.0
diff --git a/README.md b/README.md
index 91ef959..0df621a 100644
--- a/README.md
+++ b/README.md
@@ -28,6 +28,18 @@ Add to your `vim.pack.add()` call:
 
 Done. The plugin auto-loads with sensible defaults.
 
+## Recommended setup
+
+To prevent the gutter from expanding and contracting as the lightbulb
+appears and disappears, reserve the sign column width up front:
+
+```lua
+vim.o.signcolumn = "yes:2"  -- room for a diagnostic + the lightbulb
+```
+
+Without this, Neovim's default `auto` behavior will shift your text left
+and right as signs come and go.
+
 ## Configuration
 
 All options are optional. Call `setup()` only if you want to customize: