diff --git a/INSTALL b/INSTALL
index 258bec2..d158a1c 100644
--- a/INSTALL
+++ b/INSTALL
@@ -706,6 +706,15 @@ CREATE TABLE turnusers_lt (
     PRIMARY KEY (realm,name)
 );
 
+The field hmackey contains HEX string representation of the key.
+We do not store the user open passwords for long-term credentials, for security reasons.
+Storing only the HMAC key has its own implications - if you change the realm,
+you will have to update the HMAC keys of all users, because the realm is 
+used for the HMAC key generation.
+
+The key must be 32 characters (HEX representation of 16 bytes) for SHA1,
+or 64 characters (HEX representation of 32 bytes) for SHA256.
+
 # Table for short-term credentials mechanism authorisation:
 #
 CREATE TABLE turnusers_st (
@@ -760,19 +769,10 @@ CREATE TABLE turn_realm_option (
 	primary key (realm,opt)
 );
 
-The field hmackey contains HEX string representation of the key.
-We do not store the user open passwords for long-term credentials, for security reasons.
-Storing only the HMAC key has its own implications - if you change the realm,
-you will have to update the HMAC keys of all users, because the realm is 
-used for the HMAC key generation.
-
-The key must be 32 characters (HEX representation of 16 bytes) for SHA1,
-or 64 characters (HEX representation of 32 bytes) for SHA256.
-
 # oAuth key storage table.
 #
 CREATE TABLE oauth_key (
-	kid varchar(128),
+	kid varchar(128), /* 
 	ikm_key varchar(256) default '',
 	timestamp bigint default 0,
 	lifetime integer default 0,
@@ -784,6 +784,42 @@ CREATE TABLE oauth_key (
 	primary key (kid)
 );
 
+The oauth_key table fields meanings are:
+
+	kid: the kid of the key;
+
+	ikm_key - (optional) base64-encoded key ("input keying material");
+		The ikm_key is not needed if the as_rs_key and auth_key are defined
+		explicitly in the database;
+		
+	timestamp - (optional) the timestamp (in seconds) when the key 
+		lifetime started;
+	
+	lifetime - (optional) the key lifetime in seconds; the default value 
+		is 0 - unlimited lifetime.
+	
+	hkdf_hash_func - (optional) hash function for HKDF procedure; the 
+		valid values are SHA-1 and SHA-256, with SHA-256 as default;
+		The hkdf_hash_func is not needed if the as_rs_key and auth_key 
+		are defined explicitly in the database;
+		
+	as_rs_alg - oAuth token encryption algorithm; the valid values are
+		"AES-128-CBC" and "AES-256-CBC", , "AEAD-AES-128-GCM",
+		"AEAD-AES-256-GCM".
+		The default value is "AES-256-CBC";
+		
+	as_rs_key - (optional) base64-encoded AS-RS key. If not defined, then 
+		calculated with ikm_key and hkdf_hash_func. The as_rs_key length 
+		is defined by as_rs_alg.
+		
+	auth_alg - (optional) oAuth token authentication algorithm; the valid values are
+		"HMAC-SHA-256-128", "HMAC-SHA-256" and "HMAC-SHA-1".		  
+		The default value is "HMAC-SHA-256-128".
+		
+	auth_key - (optional) base64-encoded AUTH key. If not defined, then 
+		calculated with ikm_key and hkdf_hash_func. The auth_key length 
+		is defined by auth_alg.
+
 You can use turnadmin program to manage the database - you can either use 
 turnadmin to add/modify/delete users, or you can use turnadmin to produce 
 the hmac keys and modify the database with your favorite tools.
@@ -945,6 +981,11 @@ Or in the turnserver.conf file:
 
 mongo-userdb="mongodb://localhost:27017/turndb"
 
+The meanings of the MongoDB keys are the same as for the other databases, see the 
+explanations for the Postgres, for example.
+
+See the file testmongosetup.sh for the database structure examples. 
+
 XVII. Redis setup
 
 The Redis setup is well documented on their site http://redis.io. 
@@ -1013,6 +1054,8 @@ Redis TURN admin commands:
    
   $ bin/turnadmin -A -N "host=localhost dbname=0 user=turn password=turn" -u gorst -r north.gov -p hero
   $ bin/turnadmin -A -N "host=localhost dbname=0 user=turn password=turn" -u ninefingers -r north.gov -p youhavetoberealistic 
+  
+See the file testredisdbsetup.sh for the data structure examples.
 
 XVIII. Performance tuning
 
diff --git a/README.turnserver b/README.turnserver
index cb339a2..31812e4 100644
--- a/README.turnserver
+++ b/README.turnserver
@@ -190,7 +190,7 @@ Flags:
 			This option can be used with long-term credentials mechanisms only -
 			it does not make much sense with the short-term mechanism.
 			
---oauth			Support oAuth authentication.
+--oauth			Support oAuth authentication, as in the third-party TURN specs document.
 			
 --dh566			Use 566 bits predefined DH TLS key. Default size of the key is 1066.