diff --git a/Doc/lib/libdis.tex b/Doc/lib/libdis.tex
index 26ba967..3af0382 100644
--- a/Doc/lib/libdis.tex
+++ b/Doc/lib/libdis.tex
@@ -126,6 +126,10 @@
 Indicates end-of-code to the compiler, not used by the interpreter.
 \end{opcodedesc}
 
+\begin{opcodedesc}{NOP}{}
+Do nothing code.  Used as a placeholder by the bytecode optimizer.
+\end{opcodedesc}
+
 \begin{opcodedesc}{POP_TOP}{}
 Removes the top-of-stack (TOS) item.
 \end{opcodedesc}
@@ -396,6 +400,10 @@
 instruction).
 \end{opcodedesc}
 
+\begin{opcodedesc}{LIST_APPEND}{}
+Calls \code{list.append(TOS1, TOS)}.  Used to implement list comprehensions.
+\end{opcodedesc}
+
 \begin{opcodedesc}{LOAD_LOCALS}{}
 Pushes a reference to the locals of the current scope on the stack.
 This is used in the code for a class definition: After the class body