diff --git a/MAC_LINUX_DOCKER.md b/MAC_LINUX_DOCKER.md
index 6cd2247..5311f84 100644
--- a/MAC_LINUX_DOCKER.md
+++ b/MAC_LINUX_DOCKER.md
@@ -1,6 +1,8 @@
 # Learning Jenkins, 03-05: String Parameters
 Create a freestyle job with one build step.
 
+Add a string parameter for `VERSION_NUMBER`.
+
 ## MacOS, Linux, and Docker
 If you are running Jenkins on MacOS, Linux, or Docker: