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README.md

@@ -51,7 +51,7 @@ assert_eq!(PRIME_STATUS, [false, false, true, true, false, true, false, true, fa
 ## Arbitrary ranges
 The crate provides prime generation and sieving functions with suffixes, e.g. `primes_geq` and `sieve_lt`
 that can be used to work with ranges that don't start at zero. They take two generics: the number of elements
-to store in the binary and the size of the sieve used during evaluation. The sieve size must be the cieling
+to store in the binary and the size of the sieve used during evaluation. The sieve size must be the ceiling
 of the square root of the largest encountered value:
 ```rust
 //                              ceil(sqrt(5_000_000_063)) = 70_711