It is possible to add extra ntoes to the minor pentatonic scale. The most common addition is the flattened 5th degree. Once this note is added, it becomes what is known as the Blues Scale.
Here is a common moveable fingering of the Blues scale in the key of A.
Run through the fingering until you are comfortable with it and can play it from memory.
Now try this 12 bar Blues riff which makes use of the Blues scale. Once again the rhythm contains ties, this time with a triplet at the end of each bar. Practice it slowly at first and take care with the rhythm. In Blues, the rhythm is just as important as which notes you play.