diff --git a/Terminology.md b/Terminology.md
index 950dbdd..780ca16 100644
--- a/Terminology.md
+++ b/Terminology.md
@@ -3,13 +3,13 @@ Since PGPainless is based on Bouncycastle, it follows some of the terminology in
 ## Keys, KeyRings, KeyRingCollections
 
 What is considered a KeyRing in GnuPG (a collection of keys) is called a KeyRingCollection in Bouncycastle/PGPainless.
-Similarly a Key in GnuPG is called a KeyRing in BC/PGPainless. This is due to the fact, that an OpenPGP key can actually consist of more than one key (master - subkey structures). A Key in BC/PGPainless is either a master key or a sub key.
+Similarly a Key in GnuPG is called a KeyRing in BC/PGPainless. This is due to the fact, that an OpenPGP key can actually consist of more than one key (primary - subkey structures). A Key in BC/PGPainless is either a primary key or a sub key.
 
 | PGPainless Term   | GnuPG Term     | Description                                                              |
 |-------------------|----------------|--------------------------------------------------------------------------|
 | KeyRingCollection | KeyRing/KeyBox | Collection of OpenPGP keys (either of a single user or of multiple users |
-| KeyRing           | Key            | Master key which might have sub keys                                     |
-| Key               |                | Single key which might be a master key or a sub key                      |
+| KeyRing           | Key            | Primary key which might have sub keys                                     |
+| Key               |                | Single key which might be a primary key or a sub key                      |
 
 ## Public, Secret, Private
 
@@ -21,7 +21,7 @@ A PGPSecretKey names a private key which might be encrypted with a password. Fro
 | PGPPrivateKey              | Decrypted OpenPGP private key                                  |
 | PGPSecretKey               | (Possibly) password protected OpenPGP private key              |
 | PGPPublicKey               | OpenPGP public key                                             |
-| PGPSecretKeyRing           | (Possibly) password protected private master key with sub keys |
-| PGPPublicKeyRing           | OpenPGP public master key with public sub keys                 |
+| PGPSecretKeyRing           | (Possibly) password protected private primary key with sub keys |
+| PGPPublicKeyRing           | OpenPGP public primary key with public sub keys                 |
 | PGPSecretKeyRingCollection | Collection of PGPSecretKeyRings                                |
 | PGPPublicKeyRingCollection | Collection of PGPPublicKeyRings                                |
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