diff --git a/packages/sdk/README.md b/packages/sdk/README.md
index 4b5549c7aa11fbe6c65f57e5e667f28bdeb8b486..02aac2bd98b1655878b2933bb85f170e8752c3cb 100644
--- a/packages/sdk/README.md
+++ b/packages/sdk/README.md
@@ -4,6 +4,13 @@
 
 The `@eth-optimism/sdk` package provides a set of tools for interacting with Optimistic Ethereum.
 
+## NOTICE
+
+WARNING: This package is currently under construction.
+You can definitely try to use it, but you probably won't have a good time.
+Lots of pieces are missing.
+We will announce the 1.0.0 release on Discord and on Twitter once it's ready, keep an eye out!
+
 ## Installation
 
 ```