diff --git a/MAC_LINUX_DOCKER.md b/MAC_LINUX_DOCKER.md
index d03d712..6cd2247 100644
--- a/MAC_LINUX_DOCKER.md
+++ b/MAC_LINUX_DOCKER.md
@@ -1,7 +1,7 @@
 # Learning Jenkins, 03-05: String Parameters
 Create a freestyle job with one build step.
 
-# MacOS, Linux, and Docker
+## MacOS, Linux, and Docker
 If you are running Jenkins on MacOS, Linux, or Docker:
 
 1. Select the `Execute shell` build step.
@@ -11,5 +11,5 @@ If you are running Jenkins on MacOS, Linux, or Docker:
 echo "VERSION_NUMBER = $VERSION_NUMBER"
 ```
 
-# Troubleshooting Errors
+## Troubleshooting Errors