diff --git a/SConstruct b/SConstruct
index 3db621e52..3e069faa2 100644
--- a/SConstruct
+++ b/SConstruct
@@ -390,8 +390,8 @@ opts.AddVariables(
     BoolVariable('FRAMEWORK_PYTHON', 'Link against Framework Python on Mac OS X', 'True'),
     BoolVariable('PYTHON_DYNAMIC_LOOKUP', 'On OSX, do not directly link python lib, but rather dynamically lookup symbols', 'True'),
     ('FRAMEWORK_SEARCH_PATH','Custom framework search path on Mac OS X', ''),
-    BoolVariable('FULL_LIB_PATH', 'Use the full path for the libmapnik.dylib "install_name" when linking on Mac OS X', 'True'),
-    BoolVariable('ENABLE_SONAME', 'Use the full path for the libmapnik.dylib "install_name" when linking on Mac OS X', 'True'),
+    BoolVariable('FULL_LIB_PATH', 'Embed the full and absolute path to libmapnik when linking ("install_name" on OS X/rpath on Linux)', 'True'),
+    BoolVariable('ENABLE_SONAME', 'Embed a soname in libmapnik on Linux', 'True'),
     ListVariable('BINDINGS','Language bindings to build','all',['python']),
     EnumVariable('THREADING','Set threading support','multi', ['multi','single']),
     EnumVariable('XMLPARSER','Set xml parser','libxml2', ['libxml2','ptree']),