diff --git a/lib/rest_client.robot b/lib/rest_client.robot
index 3530bee..e4f1d44 100644
--- a/lib/rest_client.robot
+++ b/lib/rest_client.robot
@@ -62,7 +62,27 @@
 
 *** Keywords ***
 OpenBMC Get Request
+    [Documentation]  Do REST GET request and return the result.
+    # Example result data:
+    # Response code:200, Content:{
+    #   "data": [
+    #     "/xyz/openbmc_project/state/host0",
+    #     "/xyz/openbmc_project/state/chassis0",
+    #     "/xyz/openbmc_project/state/bmc0"
+    #   ],
+    #   "message": "200 OK",
+    #   "status": "ok"
+    # }
     [Arguments]    ${uri}    ${timeout}=30  ${quiet}=${QUIET}  &{kwargs}
+    # Description of argument(s):
+    # uri      The URI to establish connection with
+    #          (e.g. '/xyz/openbmc_project/software/').
+    # timeout  Timeout in seconds to establish connection with URI.
+    # quiet    If enabled, turns off logging to console.
+    # kwargs   Any additional arguments to be passed directly to the
+    #          Get Request call. For example, the caller might
+    #          set kwargs as follows:
+    #          ${kwargs}=  Create Dictionary  allow_redirect=${True}.
 
     Initialize OpenBMC    ${timeout}  quiet=${quiet}
     ${base_uri}=    Catenate    SEPARATOR=    ${DBUS_PREFIX}    ${uri}
@@ -74,7 +94,19 @@
     [Return]    ${ret}
 
 OpenBMC Post Request
+    [Documentation]  Do REST POST request and return the result.
+    # Example result data:
+    # <Response [200]>
     [Arguments]    ${uri}    ${timeout}=10  ${quiet}=${QUIET}  &{kwargs}
+    # Description of argument(s):
+    # uri      The URI to establish connection with
+    #          (e.g. '/xyz/openbmc_project/software/').
+    # timeout  Timeout in seconds to establish connection with URI.
+    # quiet    If enabled, turns off logging to console.
+    # kwargs   Any additional arguments to be passed directly to the
+    #          Post Request call. For example, the caller might
+    #          set kwargs as follows:
+    #          ${kwargs}=  Create Dictionary  allow_redirect=${True}.
 
     Initialize OpenBMC    ${timeout}  quiet=${quiet}
     ${base_uri}=    Catenate    SEPARATOR=    ${DBUS_PREFIX}    ${uri}
@@ -88,7 +120,17 @@
     [Return]    ${ret}
 
 OpenBMC Put Request
+    [Documentation]  Do REST PUT request on the resource identified by the URI.
     [Arguments]    ${uri}    ${timeout}=10    &{kwargs}
+    # Description of argument(s):
+    # uri      The URI to establish connection with
+    #          (e.g. '/xyz/openbmc_project/software/').
+    # timeout  Timeout in seconds to establish connection with URI.
+    # kwargs   Arguments passed to the REST call.
+    # kwargs   Any additional arguments to be passed directly to the
+    #          Put Request call. For example, the caller might
+    #          set kwargs as follows:
+    #          ${kwargs}=  Create Dictionary  allow_redirect=${True}.
 
     Initialize OpenBMC    ${timeout}
     ${base_uri}=    Catenate    SEPARATOR=    ${DBUS_PREFIX}    ${uri}
@@ -101,7 +143,17 @@
     [Return]    ${ret}
 
 OpenBMC Delete Request
+    [Documentation]  Do REST request to delete the resource identified by the
+    ...  URI.
     [Arguments]    ${uri}    ${timeout}=10    &{kwargs}
+    # Description of argument(s):
+    # uri      The URI to establish connection with
+    #          (e.g. '/xyz/openbmc_project/software/').
+    # timeout  Timeout in seconds to establish connection with URI.
+    # kwargs   Any additional arguments to be passed directly to the
+    #          Delete Request call. For example, the caller might
+    #          set kwargs as follows:
+    #          ${kwargs}=  Create Dictionary  allow_redirect=${True}.
 
     Initialize OpenBMC    ${timeout}
     ${base_uri}=    Catenate    SEPARATOR=    ${DBUS_PREFIX}    ${uri}
@@ -112,6 +164,7 @@
     [Return]    ${ret}
 
 Initialize OpenBMC
+    [Documentation]  Do a REST login connection within specified time.
     [Arguments]  ${timeout}=20  ${quiet}=${1}
     ...  ${OPENBMC_USERNAME}=${OPENBMC_USERNAME}
     ...  ${OPENBMC_PASSWORD}=${OPENBMC_PASSWORD}
@@ -127,6 +180,7 @@
     ...  ${OPENBMC_USERNAME}  ${OPENBMC_PASSWORD}
 
 Post Login Request
+    [Documentation]  Do REST login request.
     [Arguments]  ${timeout}=20  ${quiet}=${1}
     ...  ${OPENBMC_USERNAME}=${OPENBMC_USERNAME}
     ...  ${OPENBMC_PASSWORD}=${OPENBMC_PASSWORD}
@@ -146,7 +200,7 @@
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
 
 Log Out OpenBMC
-    [Documentation]  Log out REST connection with active session "openbmc".
+    [Documentation]  Log out of the openbmc REST session.
 
     ${headers}=  Create Dictionary  Content-Type=application/json
     ${data}=  Create dictionary  data=@{EMPTY}
@@ -160,23 +214,37 @@
     ...  msg=${resp}
 
 Log Request
+    [Documentation]  Log the specific REST URI, method name on the console.
     [Arguments]    &{kwargs}
     ${msg}=  Catenate  SEPARATOR=  URI:  ${AUTH_URI}  ${kwargs["base_uri"]}
     ...  , method:  ${kwargs["method"]}  , args:  ${kwargs["args"]}
     Logging    ${msg}    console=True
 
 Log Response
+    [Documentation]  Log the response code on the console.
     [Arguments]    ${resp}
     ${msg}=  Catenate  SEPARATOR=  Response code:  ${resp.status_code}
     ...  , Content:  ${resp.content}
     Logging    ${msg}    console=True
 
 Logging
+    [Documentation]  Log the specified message on the console.
     [Arguments]    ${msg}    ${console}=default False
     Log    ${msg}    console=True
 
 Read Attribute
+    [Documentation]  Retrieve attribute value from URI and return result.
+    # Example result data for the attribute 'FieldModeEnabled' in
+    # "/xyz/openbmc_project/software/attr/" :
+    # 0
     [Arguments]    ${uri}    ${attr}    ${timeout}=10  ${quiet}=${QUIET}
+    # Description of argument(s):
+    # uri               URI of the object that the attribute lives on
+    #                   (e.g. '/xyz/openbmc_project/software/').
+    # attr              Name of the attribute (e.g. 'FieldModeEnabled').
+    # timeout           Timeout for the REST call.
+    # quiet             If enabled, turns off logging to console.
+
     ${resp}=  OpenBMC Get Request  ${uri}/attr/${attr}  timeout=${timeout}
     ...  quiet=${quiet}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
@@ -218,16 +286,34 @@
     ${value}=  Read Attribute  ${uri}  ${attr}
     Should Be Equal  ${value}  ${expected_value}
 
-
 Read Properties
+    [Documentation]  Read data part of the URI object and return result.
+    # Example result data:
+    # [u'/xyz/openbmc_project/software/cf7bf9d5',
+    #  u'/xyz/openbmc_project/software/5ecb8b2c',
+    #  u'/xyz/openbmc_project/software/active',
+    #  u'/xyz/openbmc_project/software/functional']
     [Arguments]  ${uri}  ${timeout}=10  ${quiet}=${QUIET}
+    # Description of argument(s):
+    # uri               URI of the object
+    #                   (e.g. '/xyz/openbmc_project/software/').
+    # timeout           Timeout for the REST call.
+    # quiet             If enabled, turns off logging to console.
+
     ${resp}=  OpenBMC Get Request  ${uri}  timeout=${timeout}  quiet=${quiet}
     Should Be Equal As Strings  ${resp.status_code}  ${HTTP_OK}
     ${content}=  To Json  ${resp.content}
     [Return]  ${content["data"]}
 
 Call Method
+    [Documentation]  Invoke the specific REST service method.
     [Arguments]  ${uri}  ${method}  ${timeout}=10  ${quiet}=${QUIET}  &{kwargs}
+    # Description of arguments:
+    # uri      The URI to establish connection with
+    #          (e.g. '/xyz/openbmc_project/software/').
+    # timeout  Timeout in seconds to establish connection with URI.
+    # quiet    If enabled, turns off logging to console.
+    # kwargs   Arguments passed to the REST call.
 
     ${base_uri}=    Catenate    SEPARATOR=    ${DBUS_PREFIX}    ${uri}
     ${resp}=  OpenBmc Post Request  ${base_uri}/action/${method}
@@ -235,13 +321,14 @@
     [Return]     ${resp}
 
 Upload Image To BMC
+    [Documentation]  Upload image to BMC device using REST POST operation.
     [Arguments]  ${uri}  ${timeout}=10  ${quiet}=${1}  &{kwargs}
 
     # Description of argument(s):
     # uri             URI for uploading image via REST e.g. "/upload/image".
     # timeout         Time allocated for the REST command to return status
     #                 (specified in Robot Framework Time Format e.g. "3 mins").
-    # quiet           If enabled turns off logging to console.
+    # quiet           If enabled, turns off logging to console.
     # kwargs          A dictionary keys/values to be passed directly to
     #                 Post Request.