diff --git a/Day 3 lecture.md b/Day 3 lecture.md
index 6f96e52..431c220 100644
--- a/Day 3 lecture.md	
+++ b/Day 3 lecture.md	
@@ -6,5 +6,5 @@ Today's topic: text
 * Modulo math, fizzbuzz
 * What does equality really mean?
 * text input validation
-* How operators are called: \_\_add\_\_, \_\_eq\_\_ etc
+* How operators are called: \_\_add\_\_, \_\_eq\_\_ etc: https://docs.python.org/3/library/operator.html#mapping-operators-to-functions
 * the '+' operator can be used for both numeric addition and string concatenation