diff --git a/config.go b/config.go
index 83383d2..8028ed6 100644
--- a/config.go
+++ b/config.go
@@ -57,7 +57,7 @@ func newConfigFromEnv(ctx context.Context, getEnv func(string) string) (Config,
 		DatacenterPattern: renderDatacenterPattern,
 		EventNamePattern:  renderEventNamePattern,
 		RecapPromptIntro:  "A Slack thread began with the following original post.",
-		RecapPrompt:       "Summarize the following thread responses as a single sentence. Do so without any leading text.",
+		RecapPrompt:       "Summarize the responses to the Slack thread consisting of the following messages. Limit the summary to one sentence. Do not include any leading text.",
 	}
 
 	var m map[string]any