diff --git a/hostnames_allocator/README.md b/hostnames_allocator/README.md
index eb01d3b..c087b58 100644
--- a/hostnames_allocator/README.md
+++ b/hostnames_allocator/README.md
@@ -63,7 +63,7 @@ Memory requirements are `O(log(number of ranges))` plus combined length of all h
 
 Constant factors were not considered in this implementation.
 
-Compiled binary size on `x86_64-unknown-linux-musl` target is 506KB.
+Compiled binary size on `x86_64-unknown-linux-musl` target, in release mode, is 506KB.
 
 ## Usage