diff --git a/education/software development/ECE1400/2024-09-11.md b/education/software development/ECE1400/2024-09-11.md
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@@ -1,4 +1,16 @@
 Chapter 4 exercises assigned, due monday
 
 # Operators
-C emphasizes *expressions* rather than stateme
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+C emphasizes *expressions* rather than statements.
+
+Expressions are built from variables, constants, and operators.
+
+C provides 5 binary arithmetic operator (arithmetic meaning it requires two things to operate on):
+- Addition
+- Subtraction
+- Multiplication
+- Division
+- Modulus
+
+Unary operators only require *one* thing to operate on. 
+- Positive and minus signs
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