diff --git a/doc/ALGORITHMS.md b/doc/ALGORITHMS.md
index 065fe63d..05cb3324 100644
--- a/doc/ALGORITHMS.md
+++ b/doc/ALGORITHMS.md
@@ -72,7 +72,7 @@ efficiently uses the CPU's multi level cache hierarchy.
 ### Optimizations used in primesieve
 
  * Uses a bit array with 8 flags each 30 numbers for sieving
- * Pre-sieves multiples of small primes <= 163
+ * Pre-sieves multiples of small primes ≤ 163
  * Compresses the sieving primes in order to improve cache efficiency [[5]](#references)
  * Starts crossing off multiples at the square
  * Uses a modulo 210 wheel that skips multiples of 2, 3, 5 and 7
diff --git a/src/README.md b/src/README.md
index f6139e5c..83143a01 100644
--- a/src/README.md
+++ b/src/README.md
@@ -52,9 +52,9 @@
   buckets and only when there are no more buckets in the stock the
   MemoryPool will allocate new buckets.
 
-* **PreSieve** is used to pre-sieve multiples of small primes <= 163 to speed
+* **PreSieve** is used to pre-sieve multiples of small primes ≤ 163 to speed
   up the sieve of Eratosthenes. The ```PreSieveTables.hpp``` header contains
-  16 static lookup tables which have been sieved using the primes <= 163. The
+  16 static lookup tables which have been sieved using the primes ≤ 163. The
   total size of all pre-sieve lookup tables is about 123 kilobytes. Whilst
   sieving, we perform a bitwise AND of the pre-sieve lookup tables and store
   the result in the sieve array. Pre-sieving provides a speedup of up to 30%