diff --git a/doc/Abbreviations.md b/doc/Abbreviations.md
index 60517c6..f0b9a31 100644
--- a/doc/Abbreviations.md
+++ b/doc/Abbreviations.md
@@ -1,11 +1,11 @@
 
-|Abbreviation|Description|
-|------------|-----------|
-|CA|Certificate Authority|
-|EST|Enrollment over Secure Transport|
-|PKI|Private Key Infrastructure|
+|Abbreviation|Short Description|Long Description|
+|------------|-----------|--------|
+|CA|Certificate Authority||
+|CSR|Certificate Signing Request|This is a formal request asking a CA to sign a certificate, and it contains the public key of the entity requesting the certificate and some information about the entity. This data will all be part of the certificate.|
+|EST|Enrollment over Secure Transport||
+|PKI|Private Key Infrastructure||
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