diff --git a/CMakeLists.txt b/CMakeLists.txt
index 8c4a8d65..d2a50996 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -8,14 +8,14 @@ set(COMBINED_PROJECT TRUE)
 option(STATIC "Set to ON to build xlnt as a static library instead of a shared library" OFF)
 
 # c++ language standard to use
-set(XLNT_LANGS 11 14 17)
+set(XLNT_VALID_LANGS 11 14 17)
 set(XLNT_CXX_LANG "14" CACHE STRING "c++ language features to compile with")
 # enumerate allowed values for cmake gui
-set_property(CACHE XLNT_CXX_LANG PROPERTY STRINGS ${XLNT_LANGS})
-# validate value is in XLNT_LANGS
-list(FIND XLNT_LANGS ${XLNT_CXX_LANG} index)
+set_property(CACHE XLNT_CXX_LANG PROPERTY STRINGS ${XLNT_VALID_LANGS})
+# validate value is in XLNT_VALID_LANGS
+list(FIND XLNT_VALID_LANGS ${XLNT_CXX_LANG} index)
 if(index EQUAL -1)
-    message(FATAL_ERROR "XLNT_CXX_LANG must be one of ${XLNT_LANGS}")
+    message(FATAL_ERROR "XLNT_CXX_LANG must be one of ${XLNT_VALID_LANGS}")
 endif()
 
 
diff --git a/source/CMakeLists.txt b/source/CMakeLists.txt
index 90568121..2ea048d3 100644
--- a/source/CMakeLists.txt
+++ b/source/CMakeLists.txt
@@ -154,6 +154,7 @@ else()
   target_compile_definitions(xlnt PUBLIC XLNT_STATIC=1)
 endif()
 
+# requires cmake 3.8+
 #target_compile_features(xlnt PUBLIC cxx_std_${XLNT_CXX_LANG})
 
 # Includes
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index d6b9361b..74c24352 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -48,6 +48,7 @@ target_include_directories(xlnt.test
 
 set(XLNT_TEST_DATA_DIR ${CMAKE_CURRENT_SOURCE_DIR}/data)
 target_compile_definitions(xlnt.test PRIVATE XLNT_TEST_DATA_DIR=${XLNT_TEST_DATA_DIR})
+# requires cmake 3.8+
 #target_compile_features(xlnt.test PRIVATE cxx_std_${XLNT_CXX_LANG})
 
 if(MSVC)