http://docs.mongodb.org/manual/tutorial/build-indexes-on-replica-sets/

Procedure current reads like a single flow:

• Stop One Secondary
• Build the Index
• Restart the Program mongod
• Build Indexes on all Secondaries

However, the first three are really sub-steps of the fourth. They do appear as sub-steps as well but having them listed above "Build Indexes" and with the same level of indentation, as if they are preceding steps in a flow, is confusing.