diff --git a/README.md b/README.md
index b50456f..839eb09 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,12 @@ called `johndoe`, the contents of these files should be edited to allocate
 `jogndoe:<some number>:65539`
 
 Where `<some number>` was set by your OS when the `johndoe` user was created
-(you can ignore this).  Only the last number needs to be increased.
+(you can ignore this).  Only the last number needs to be increased.  This
+change will be effective on next login, or immediately by running:
+
+`podman system migrate`
+
+*Note:* This will stop any currently running containers.
 
 #### Runner registration (step 3)