Kumar, who last played a T20I game in the home series against South Africa in October last year, made a comeback in India's last league match in Asia Cup last night and returned with figures of 4-2-8-2.
"It feels great to get back to playing (in the XI). To be honest, I was nervous when I walked out to bowl since I was playing after a long gap," he told BCCI.TV.
The 26-year-old said he wants to add one key aspect to his bowling.
"I want work on my slower deliveries. I know I can bowl a yorker at the death, but if I can bowl a slower ball as well then it can prove to be an advantage for me. I want to develop a good slower delivery and I am working on the same at the moment," he said.
More From This Section
"He is a hardworking guy and he works hard in the nets and in the gym and that is something that is important for the fast bowlers," Dhoni said.
"Fast bowlers have to keep themselves fit and take the break in the best possible manner if you are not in the playing eleven. I feel the break has helped him increase the pace, and at the same time, it has not affected his swing bowling which is the key.