DOC: notes an adding more emails

README.md

@@ -634,6 +634,70 @@ Finish by saving the keys.
 gpg> save
 ```
 
+## Add extra emails
+
+```console
+gpg> adduid
+Real name: Dr Duh
+Email address: DrDuh@other.org
+Comment:
+You selected this USER-ID:
+    "Dr Duh <DrDuh@other.org>"
+
+sec  rsa4096/0xFF3E7D88647EBCDB
+    created: 2017-10-09  expires: never       usage: SC
+    trust: ultimate      validity: ultimate
+ssb  rsa4096/0xBECFA3C1AE191D15
+    created: 2017-10-09  expires: never       usage: S
+ssb  rsa4096/0x5912A795E90DD2CF
+    created: 2017-10-09  expires: never       usage: E
+ssb  rsa4096/0x3F29127E79649A3D
+    created: 2017-10-09  expires: never       usage: A
+[ultimate] (1). Dr Duh <doc@duh.to>
+[ unknown] (2). Dr Duh <DrDuh@other.org>
+
+
+gpg> trust
+sec  rsa4096/0xFF3E7D88647EBCDB
+    created: 2017-10-09  expires: never       usage: SC
+    trust: ultimate      validity: ultimate
+ssb  rsa4096/0xBECFA3C1AE191D15
+    created: 2017-10-09  expires: never       usage: S
+ssb  rsa4096/0x5912A795E90DD2CF
+    created: 2017-10-09  expires: never       usage: E
+ssb  rsa4096/0x3F29127E79649A3D
+    created: 2017-10-09  expires: never       usage: A
+[ultimate] (1). Dr Duh <doc@duh.to>
+[ unknown] (2). Dr Duh <DrDuh@other.org>
+
+Please decide how far you trust this user to correctly verify other users' keys
+(by looking at passports, checking fingerprints from different sources, etc.)
+
+  1 = I don't know or won't say
+  2 = I do NOT trust
+  3 = I trust marginally
+  4 = I trust fully
+  5 = I trust ultimately
+  m = back to the main menu
+
+Your decision? 5
+Do you really want to set this key to ultimate trust? (y/N) y
+
+sec  rsa4096/0xFF3E7D88647EBCDB
+    created: 2017-10-09  expires: never       usage: SC
+    trust: ultimate      validity: ultimate
+ssb  rsa4096/0xBECFA3C1AE191D15
+    created: 2017-10-09  expires: never       usage: S
+ssb  rsa4096/0x5912A795E90DD2CF
+    created: 2017-10-09  expires: never       usage: E
+ssb  rsa4096/0x3F29127E79649A3D
+    created: 2017-10-09  expires: never       usage: A
+[ultimate] (1). Dr Duh <doc@duh.to>
+[ unknown] (2). Dr Duh <DrDuh@other.org>
+
+gpg> save
+```
+
 # Verify
 
 List the generated secret keys and verify the output: