diff --git a/misspell.csv b/misspell.csv
index 82d4be429..965191c30 100644
--- a/misspell.csv
+++ b/misspell.csv
@@ -22,6 +22,7 @@ implmented,implemented
 interrut,interrupt
 interupt,interrupt
 measuing,measuring
+numer of,number of
 orignal,original
 overrided,overridden
 poiners,pointers
diff --git a/src/runtime/runtime_nrf.go b/src/runtime/runtime_nrf.go
index 2f58c3518..729c6bb20 100644
--- a/src/runtime/runtime_nrf.go
+++ b/src/runtime/runtime_nrf.go
@@ -103,7 +103,7 @@ func nanosecondsToTicks(ns int64) timeUnit {
 	return timeUnit(ns * 64 / 1953125)
 }
 
-// Monotonically increasing numer of ticks since start.
+// Monotonically increasing number of ticks since start.
 func ticks() timeUnit {
 	// For some ways of capturing the time atomically, see this thread:
 	// https://www.eevblog.com/forum/microcontrollers/correct-timing-by-timer-overflow-count/msg749617/#msg749617
diff --git a/src/runtime/runtime_nrf52840.go b/src/runtime/runtime_nrf52840.go
index 47f9a8db1..41c36fe5f 100644
--- a/src/runtime/runtime_nrf52840.go
+++ b/src/runtime/runtime_nrf52840.go
@@ -106,7 +106,7 @@ func nanosecondsToTicks(ns int64) timeUnit {
 	return timeUnit(ns * 64 / 1953125)
 }
 
-// Monotonically increasing numer of ticks since start.
+// Monotonically increasing number of ticks since start.
 func ticks() timeUnit {
 	// For some ways of capturing the time atomically, see this thread:
 	// https://www.eevblog.com/forum/microcontrollers/correct-timing-by-timer-overflow-count/msg749617/#msg749617