diff --git a/2-IOC-deployment.md b/2-IOC-deployment.md
index 39cfb89e2ea9730c0ffa057160758c057f42ff86..a8b0218d3ad0960f48962886cee92a5bfe84d567 100644
--- a/2-IOC-deployment.md
+++ b/2-IOC-deployment.md
@@ -315,6 +315,14 @@ perl -CSD /APSshare/epics/base-7.0.4.1/bin/rhel8-x86_64/convertRelease.pl -t /ho
 ```
 </details>
 
+<details>
+<summary>what does this mean?</summary>
+
+Perl is a programming language commonly used for scripting and text processing. The command is essentially invoking the convertRelease.pl script and passing the path to the envPaths file as an argument. The script will process the envPaths file and perform any necessary conversions to set up the necessary environment variables.
+
+</details>
+
+
 #### 2.10.4 Run the IOC
 
 Start the IOC and confirm the error is resolved.