Print substance reservoirs

A non-transitory machine-readable medium storing instructions executable by a processing resource to:

• provide user instructions responsive to a refill container connecting to a fill port, wherein the user instructions include haptic feedback;
• determine if an approved refill container is connected to a correct fill port;
• and
• refill a print substance reservoir responsive to a determination that the approved refill container is connected to the correct fill port.

A method comprising:

• detecting, by a processing resource, when a refill container is connected to a fill port;
• receiving, by the processing resource, a refill container information from a memory device included in the refill container;
• determining, by the processing resource, if a refill process should initiate;
• refilling, by the processing resource, a print substance reservoir responsive to a determination that the refill process should initiate;
• providing, by the processing resource, haptic feedback to convey information to a user responsive to initiation of the refill process.