diff --git a/book/intro/chapter.tex b/book/intro/chapter.tex
index 9154fcf..57930f6 100644
--- a/book/intro/chapter.tex
+++ b/book/intro/chapter.tex
@@ -50,7 +50,8 @@ small blocks called \glspl{register}.  These registers are used to
 hold individual data values that can be manipulated by the instructions
 that are executed by the CPU.  
 
-Another type of volatile storage is main memory.
+Another type of volatile storage is main memory 
+(sometimes called \acrshort{ram})
 Main memory is connected to a computer's CPU and is used to hold
 the data and instructions that can not fit into the CPU registers.
 
@@ -78,7 +79,8 @@ the registers and main memory is a desirable trait of good programs.
 Non-volatile storage is characterized by the fact that it will {\em NOT} 
 lose its contents when it is powered off.
 
-Common types of non-volatile storage are disc drives, flash cards and USB 
+Common types of non-volatile storage are disc drives, 
+\acrshort{rom} flash cards and USB 
 drives.  Prices can vary widely depending on size and transfer speeds.
 
 It is typical for a computer system's non-volatile storage to operate