Misprint in the comments?

[Nicoskin]

lib/src/phy/ch_estimation/refsignals_dl_nbiot.c

91-93

/** Allocates and precomputes the Narrowband Reference Signal (NRS) signal for
 * the 20 slots in a subframe
 */

Why are there 20 slots mentioned in a subframe when there are 2 slots in a subframe and 20 slots in a frame?
Slot - 0.5ms
Subframe - 1ms
Frame - 10ms
Or am I wrong about something?

lib/src/phy/ch_estimation/refsignals_dl.c

35-36

/** Allocates memory for the 20 slots in a subframe
 */

62-64

 /** Allocates and precomputes the Cell-Specific Reference (CSR) signal for
 * the 20 slots in a subframe
 */