diff --git a/education/software development/ECE1400/Chapter 13 Exercises.md b/education/software development/ECE1400/Chapter 13 Exercises.md
index 62bec4f..aa0c798 100644
--- a/education/software development/ECE1400/Chapter 13 Exercises.md	
+++ b/education/software development/ECE1400/Chapter 13 Exercises.md	
@@ -2,4 +2,7 @@
 
 b. `printf("%c", "\n");` - This is invalid because the double quotes make `\n` a string, but it's being displayed with the `%c`formatting specifier.
 c. `printf(%s, '\n');` - This is invalid because it's trying to display a `char` using the string formatting specifier.
-e. `printf('\n'`
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+e. `printf('\n');` - `printf`'s first argument should be a string, not a `char`.
+h. `putchar("\n");` - `putchar`'s first argument should be a `char`, not a string.
+i. `puts('\n');` - `puts`'s first argument should be a string, not a `char`.
+j. `puts("\n");` - `puts` will write a newline after writing a string, so this will write two newlines. 
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