diff --git a/README.md b/README.md
index fc73494..374e179 100644
--- a/README.md
+++ b/README.md
@@ -70,7 +70,7 @@ After four weeks, the compiler has now matured significantly.  There are still s
 
 The compiler is command line driven, and creates an executable .prg file.
 
-    oscar64 {-i=includePath} [-o=output.prg] [-cr=runtime.c] [-e] [-n] [-dSYMBOL[=value]] {source.c}
+    oscar64 {-i=includePath} [-o=output.prg] [-rt=runtime.c] [-e] [-n] [-dSYMBOL[=value]] {source.c}
 	
 * -i : additional include paths
 * -o : optional output file name
diff --git a/oscar64/oscar64.cpp b/oscar64/oscar64.cpp
index 78a178e..a155055 100644
--- a/oscar64/oscar64.cpp
+++ b/oscar64/oscar64.cpp
@@ -171,7 +171,7 @@ int main(int argc, const char** argv)
 	}
 	else
 	{
-		printf("oscar64 {-i=includePath} [-o=output.prg] [-cr=runtime.c] [-e] [-n] [-dSYMBOL[=value]] {source.c}\n");
+		printf("oscar64 {-i=includePath} [-o=output.prg] [-rt=runtime.c] [-e] [-n] [-dSYMBOL[=value]] {source.c}\n");
 
 		return 0;
 	}