diff --git a/lectures/L04-slides.tex b/lectures/L04-slides.tex
index 7a302ab..7fbd2cc 100644
--- a/lectures/L04-slides.tex
+++ b/lectures/L04-slides.tex
@@ -575,7 +575,7 @@
 
 	We can expand on the five state model by considering disk.
 
-	A process my not be entirely in memory!
+	A process may not be entirely in memory!
 
 	Users often want more processes running than fit in memory.
 
diff --git a/lectures/L09-slides.tex b/lectures/L09-slides.tex
index 104f06a..6d57799 100644
--- a/lectures/L09-slides.tex
+++ b/lectures/L09-slides.tex
@@ -319,7 +319,7 @@
 
 	If two processes use the same input values for \texttt{ftok()} they will get the same result, so that's one method.
 
-	Or, if a parent attaches a shared memory segment and then calls \texttt{fork()}, the child inherits the shared memory segments, so it's is already set up.
+	Or, if a parent attaches a shared memory segment and then calls \texttt{fork()}, the child inherits the shared memory segments, so it's already set up.
 
 \end{frame}