diff --git a/.changeset/prepare-connected-sources.md b/.changeset/prepare-connected-sources.md
index 69d4e199..e0a2722e 100644
--- a/.changeset/prepare-connected-sources.md
+++ b/.changeset/prepare-connected-sources.md
@@ -2,4 +2,4 @@
 '@vercel/prepare-flags-definitions': minor
 ---
 
-Embed definitions for every project connected to the deployment's project. `flags:projectId=` values in the environment are no longer read.
+Embed definitions for every project connected to the deployment's project. Remove the internal `flags:projectId=` environment option introduced in 0.5.0.
diff --git a/.changeset/remove-project-id-connection-string.md b/.changeset/remove-project-id-connection-string.md
index 588fa74a..949aa2b7 100644
--- a/.changeset/remove-project-id-connection-string.md
+++ b/.changeset/remove-project-id-connection-string.md
@@ -2,4 +2,4 @@
 '@vercel/flags-core': minor
 ---
 
-Remove `projectId` from connection strings.
+Remove the internal `projectId` connection string option introduced in 1.9.0. SDK keys and `sdkKey=` connection strings are unchanged.