diff --git a/tests/bluetooth/tester/btp_spec.txt b/tests/bluetooth/tester/btp_spec.txt
index e0efdbd7210..b0e924bbbbc 100644
--- a/tests/bluetooth/tester/btp_spec.txt
+++ b/tests/bluetooth/tester/btp_spec.txt
@@ -553,6 +553,15 @@ Commands and responses:
 					UUID (2 or 16 octets)
 		Response parameters:	Characteristic_ID (2 octets)
 
+		Possible values for Service_ID:
+					0x0000 = Add in sequence
+					0x0001-0xffff = Add to service
+
+		Possible response parameters:
+					0x0000 = Relative ID, will be set after
+					start_server
+					0x0001-0xffff = ID in db
+
 		Possible values for the Properties parameter are a bit-wise
 		of the following bits:
 
@@ -595,6 +604,15 @@ Commands and responses:
 					UUID (2 or 16 octets)
 		Response parameters:	Descriptor_ID (2 octets)
 
+		Possible values for Characteristic_ID:
+					0x0000 = Add in sequence
+					0x0001-0xffff = Add to characteristic
+
+		Possible response parameters:
+					0x0000 = Relative ID, will be set after
+					start_server
+					0x0001-0xffff = ID in db
+
 		This command is used to add new characteristic descriptor
 		to GATT Server. The command shall be used right after
 		Add Characteristic or previous Add Descriptor command.
@@ -622,6 +640,11 @@ Commands and responses:
 					Value (1-512 octets)
 		Response parameters:	<none>
 
+		Possible values for Characteristic_ID:
+					0x0000 = Set last attribute in db value
+					0x0001-0xffff = Set value of attribute
+					under ID
+
 		This command is used to set the value of characteristic
 		or descriptor.
 
@@ -656,6 +679,12 @@ Commands and responses:
 					Encryption_Key_Size (1 octet)
 		Response parameters:	<none>
 
+		Possible values for Attribute_ID:
+					0x0000 = Set encryption key of last
+					added attribute
+					0x0001-0xffff = Set enctryption of
+					attribute under ID
+
 		This command is used to set required Encryption Key Size of an
 		attribute. It shall be used only if encryption or authentication
 		is needed to have access to this attribute. Otherwise an error