diff --git a/topical-units/env-python/BASICS.md b/topical-units/env-python/BASICS.md
index 9d5b35d2ea82ef182a75019c4c678a99ed28a277..f7088ae268eb34a5a6322146fa8b708acea2a37c 100644
--- a/topical-units/env-python/BASICS.md
+++ b/topical-units/env-python/BASICS.md
@@ -8,7 +8,9 @@ print("test two")
 print("test three")     # Comments can also be on the end of a line
 #print("test four")
 ```
-"test four" will not be printed, since that line is commented out. 
+Comments are used to insert non-code text into a script. This can be to describe parts of your code and what they do, or quick notes to yourself or others to help organize and annotate. 
+
+In Python, comments are represented with a `#` at the beginning. Any line starting with a `#` will be ignored as the code is run. In this example, the first three print statements will run normally, and "test four" will not be printed, since that line is commented out. 
 
 ## Math
 ```py