diff --git a/frontend/dockerfile/docs/reference.md b/frontend/dockerfile/docs/reference.md
index 312ea9f15f48..14c5f0cf2439 100644
--- a/frontend/dockerfile/docs/reference.md
+++ b/frontend/dockerfile/docs/reference.md
@@ -2356,6 +2356,7 @@ However, if a health check succeeds during the start period, the container is co
 started and all consecutive failures will be counted towards the maximum number of retries.
 
 **start interval** is the time between health checks during the start period.
+This option requires Docker Engine version 25.0 or later.
 
 There can only be one `HEALTHCHECK` instruction in a Dockerfile. If you list
 more than one then only the last `HEALTHCHECK` will take effect.