diff --git a/docs/aoa/quicklook.rst b/docs/aoa/quicklook.rst
index 3b2d0fa0..2dbd84ce 100644
--- a/docs/aoa/quicklook.rst
+++ b/docs/aoa/quicklook.rst
@@ -13,11 +13,12 @@ If the per CPU mode is on (by clicking the ``1`` key):
 .. image:: ../_static/quicklook-percpu.png
 
 In the Curses/terminal interface, it is also possible to switch from bar to
-sparkline using 'S' hot key or --sparkline command line option. Please be
-aware that sparklines use the Glances history and will not be available
-if the history is disabled from the command line.
+sparkline using 'S' hot key or --sparkline command line option (nned the
+sparklines Python lib on your system). Please be aware that sparklines use
+the Glances history and will not be available if the history is disabled from
+the command line.
 
-.. image:: ../_static/sparkline.png  
+.. image:: ../_static/sparkline.png
 
 .. note::
     Limit values can be overwritten in the configuration file under
diff --git a/glances/outputs/glances_sparklines.py b/glances/outputs/glances_sparklines.py
index 5bab8efd..2f925e55 100644
--- a/glances/outputs/glances_sparklines.py
+++ b/glances/outputs/glances_sparklines.py
@@ -27,13 +27,13 @@ sparklines_module = True
 try:
     from sparklines import sparklines
 except ImportError as e:
-    logger.debug("Sparklines module not found ({})".format(e))
+    logger.warning("Sparklines module not found ({})".format(e))
     sparklines_module = False
 
 try:
     '\xe2\x96\x81'.decode('utf-8')
 except ImportError as e:
-    logger.debug("UTF-8 for sparklines module not available".format(e))
+    logger.warning("UTF-8 is mandatory for sparklines ({})".format(e))
     sparklines_module = False
 
 
@@ -88,4 +88,9 @@ class Sparkline(object):
 
     def __str__(self):
         """Return the sparkline."""
-        return self.get()
+        ret = self.get()
+        if self.__with_text:
+            percents_without_none = [x for x in self.percents if x is not None]
+            if len(percents_without_none) > 0:
+                ret = '{}{:5.1f}%'.format(ret, percents_without_none[-1])
+        return ret
diff --git a/optional-requirements.txt b/optional-requirements.txt
index 97f0180a..00c7cf24 100644
--- a/optional-requirements.txt
+++ b/optional-requirements.txt
@@ -21,6 +21,7 @@ pystache
 pyzmq
 requests
 scandir; python_version < "3.5"
+sparklines
 statsd
 wifi
 zeroconf==0.19.1; python_version < "3.0"
diff --git a/setup.py b/setup.py
index a6423655..0632627e 100755
--- a/setup.py
+++ b/setup.py
@@ -67,6 +67,7 @@ def get_install_extras_require():
         'raid': ['pymdstat'],
         'smart': ['pySMART.smartx'],
         'snmp': ['pysnmp'],
+        'sparklines': ['sparklines'],
         'web': ['bottle', 'requests'],
         'wifi': ['wifi']
     }