requirements.txt typo

[hk-mp5a3]

When I try to run

$ pip install -r requirements.txt 

I received a message:

Requirement already satisfied: numpy>=1.12.0 in /Users/username/anaconda3/lib/python2.7/site-packages (from -r requirements.txt (line 1)) (1.15.0)
Requirement already satisfied: scipy>=0.18.1 in /Users/username/anaconda3/lib/python2.7/site-packages (from -r requirements.txt (line 2)) (1.1.0)
Collecting sklearn>=0.9 (from -r requirements.txt (line 3))
  Could not find a version that satisfies the requirement sklearn>=0.9 (from -r requirements.txt (line 3)) (from versions: 0.0)
No matching distribution found for sklearn>=0.9 (from -r requirements.txt (line 3))

Should the requirement for scikit-learn be changed from sklearn>=0.9 to scikit-learn>=0.9 in requirements.txt?