diff --git a/lectures/L16-slides-The_Readers-Writers_Problem.pdf b/lectures/L16-slides-The_Readers-Writers_Problem.pdf
index e62cb7c..22dc5ea 100644
Binary files a/lectures/L16-slides-The_Readers-Writers_Problem.pdf and b/lectures/L16-slides-The_Readers-Writers_Problem.pdf differ
diff --git a/lectures/L16-slides.tex b/lectures/L16-slides.tex
index dff2a39..364a9e7 100644
--- a/lectures/L16-slides.tex
+++ b/lectures/L16-slides.tex
@@ -450,7 +450,7 @@
 
 	Unlock works just like the regular mutex unlock.
 
-	We do not need to specify what kind of luck we are releasing.
+	We do not need to specify what kind of lock we are releasing.
 
 \end{frame}
 
@@ -511,7 +511,7 @@
   sem_post( &roomEmpty );
 }
 
-void* reader( void* read ) {
+void* reader( void* arg ) {
   pthread_mutex_lock( &mutex );
   readers++;
   if ( readers == 1 ) {
@@ -559,7 +559,7 @@
   pthread_rwlock_unlock( &rwlock );
 }
 
-void* reader( void* read ) {
+void* reader( void* arg ) {
   pthread_rwlock_rdlock( &rwlock );
   read_data( arg );
   pthread_rwlock_unlock( &rwlock );
diff --git a/lectures/L26-Asynchronous_I_O_with_select_poll.pdf b/lectures/L26-Asynchronous_I_O_with_select_poll.pdf
index fb203e4..418bd03 100644
Binary files a/lectures/L26-Asynchronous_I_O_with_select_poll.pdf and b/lectures/L26-Asynchronous_I_O_with_select_poll.pdf differ
diff --git a/lectures/L26-slides-Asynchronous_I_O_with_select_poll.pdf b/lectures/L26-slides-Asynchronous_I_O_with_select_poll.pdf
index 5fb6a39..35f44a8 100644
Binary files a/lectures/L26-slides-Asynchronous_I_O_with_select_poll.pdf and b/lectures/L26-slides-Asynchronous_I_O_with_select_poll.pdf differ
diff --git a/lectures/L26-slides.tex b/lectures/L26-slides.tex
index 5fec0d7..b53a428 100644
--- a/lectures/L26-slides.tex
+++ b/lectures/L26-slides.tex
@@ -229,7 +229,7 @@
 
 	The \texttt{readfds} are obviously sockets we are interested in reading from.
 
-	\texttt{writefds} are accordingly those we are interested in writing from.
+	\texttt{writefds} are accordingly those we are interested in writing to.
 
 	But what about the \texttt{exceptfds} -- this isn't Java, it's not like we're going to get a \texttt{SocketDoesNotFeelLikeDoingWorkRightNowException}.
 
diff --git a/lectures/L26.tex b/lectures/L26.tex
index 8e1d085..ea6734c 100644
--- a/lectures/L26.tex
+++ b/lectures/L26.tex
@@ -69,7 +69,7 @@ \subsection*{Third option: \texttt{select()}} Our wish is granted. The third opt
 
 But that last one, \texttt{FD\_ISSET}, is a little different. It's not as if we would forget whether we put a file descriptor in the set. It's really for us to see what happens after \texttt{select()} is called -- we can find out whether a given file descriptor is in a particular set or not.
 
-The \texttt{readfds} are obviously sockets we are interested in reading from and \texttt{writefds} are accordingly those we are interested in writing from. But what about the \texttt{exceptfds} -- this isn't Java, it's not like we're going to get a \texttt{SocketDoesNotFeelLikeDoingWorkRightNowException}. No, this is for sockets that are in an exceptional state, which usually means there is Out-Of-Band (OOB) data on a TCP socket. We didn't cover this earlier in network communication and we will also not be going into this subject now. But you can find out if a socket is in that state if you have a reason.
+The \texttt{readfds} are obviously sockets we are interested in reading from and \texttt{writefds} are accordingly those we are interested in writing to. But what about the \texttt{exceptfds} -- this isn't Java, it's not like we're going to get a \texttt{SocketDoesNotFeelLikeDoingWorkRightNowException}. No, this is for sockets that are in an exceptional state, which usually means there is Out-Of-Band (OOB) data on a TCP socket. We didn't cover this earlier in network communication and we will also not be going into this subject now. But you can find out if a socket is in that state if you have a reason.
 
 We don't have to use all three of \texttt{readfds}, \texttt{writefds}, and \texttt{exceptfds} in a call to \texttt{select()} if we do not need them all. If we have only read sockets, we put them all in the \texttt{readfds} set and can just give \texttt{NULL} or empty \texttt{fd\_set}s in for the other parameters~\cite{getaddrinfo}.