diff --git a/src/doc/rustc/src/platform-support/vxworks.md b/src/doc/rustc/src/platform-support/vxworks.md
index c0a818558e0bf..7c73ee8cfa890 100644
--- a/src/doc/rustc/src/platform-support/vxworks.md
+++ b/src/doc/rustc/src/platform-support/vxworks.md
@@ -20,6 +20,12 @@ Target triplets available:
 
 ## Requirements
 
+### OS version
+
+The minimum supported version is VxWorks 7.
+
+## Building
+
 Rust for each target can be cross-compiled with its specific target vsb configuration. Std support is added but not yet fully tested.
 
 ## Building the target