diff --git a/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp b/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
index 185b28224..3f67d6ab0 100644
--- a/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
+++ b/src/osgPlugins/OpenFlight/ReaderWriterFLT.cpp
@@ -244,7 +244,7 @@ class FLTReaderWriter : public ReaderWriter
             supportsOption("convertToNauticalMiles","Import option");
 
             supportsOption( "version=<ver>", "Export option: Specifies the version of the output OpenFlight file. Supported values include 15.7, 15.8, and 16.1. Default is 16.1. Example: \"version=15.8\"." );
-            supportsOption( "units=<units>", "Export option: Specifies the contents of the Units field of the OpenFliht header record. Valid values include INCHES, FEET, METERS, KILOMETERS, and NATICAL_MILES. Default is METERS. Example: \"units=METERS\"." );
+            supportsOption( "units=<units>", "Export option: Specifies the contents of the Units field of the OpenFlight header record. Valid values include INCHES, FEET, METERS, KILOMETERS, and NAUTICAL_MILES. Default is METERS. Example: \"units=METERS\"." );
             supportsOption( "validate", "Export option: If present in the Options string, the plugin does not write an OpenFlight file. Instead, it returns an indication of the scene graph's suitability for OpenFlight export." );
             supportsOption( "tempDir=<dir>", "Export option: Specifies the directory to use for creation of temporary files. If not specified, the directory is taken from the file name. If the file doesn't contain a path, the current working directory is used. Applications should set this to the name of their app-specific temp directory. If the path contains spaces, use double quotes to ensure correct parsing. Examples: \"tempDir=/tmp\", \"tempDir=\"C:\\My Temp Dir\"." );
             supportsOption( "lighting=<ON|OFF>", "Export option: Specifies a default enable/disable state for lighting, for Nodes in the exported scene graph that don't set it explicitly. By default, the exporter assumes lighting is enabled (GL_LIGHTING ON). Set this to either ON or OFF. Example: \"lighting=OFF\"." );