diff --git a/CMakeLists.txt b/CMakeLists.txt
index d0312076..a1f785db 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -10,7 +10,7 @@ option(WITH_STATIC    "Static build" OFF)
 option(WITH_UPNP      "Include support for UPnP client" OFF)
 option(WITH_TESTS     "Build unit tests" OFF)
 option(WITH_BENCHMARK "Build benchmarking code" OFF)
-option(WITH_OPTIMIZE  "Optmizeation flags" OFF)
+option(WITH_OPTIMIZE  "Optimization flags" OFF)
 
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/build/cmake_modules")
 set(CMAKE_RUNTIME_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR})
diff --git a/build/BUILD_NOTES.md b/build/BUILD_NOTES.md
index 874f27c9..0ddcd4f7 100644
--- a/build/BUILD_NOTES.md
+++ b/build/BUILD_NOTES.md
@@ -8,7 +8,7 @@ Available cmake options:
 * WITH_HARDENING -- enable hardening features (ON/OFF) (gcc only)
 * WITH_TESTS -- build tests (ON/OFF)
 * WITH_BENCHMARK -- build bechmarking code (ON/OFF)
-* WITH_OPTIMIZE -- enable optimization flags (ON/OFF)
+* WITH_OPTIMIZE -- enable optimization flags (ON/OFF) (not for MSVC)
 
 Debian
 ------
@@ -28,7 +28,7 @@ Optional packages:
 FreeBSD
 -------
 
-Branch 9.X has gcc v4.2, that knows nothing about required c++11 standart.
+Branch 9.X has gcc v4.2, that knows nothing about required c++11 standard.
 
 Required ports: