diff --git a/math.c b/math.c
index 8032e41ae3..5e2cbe9b74 100644
--- a/math.c
+++ b/math.c
@@ -596,7 +596,7 @@ math_log10(VALUE unused_obj, VALUE x)
  *
  *    Math.sqrt(10**46).to_i  #=> 99999999999999991611392 (!)
  *
- *  See also BigDecimal#sqrt.
+ *  See also BigDecimal#sqrt and Integer.sqrt.
  */
 
 static VALUE