diff --git a/pages/common/flex.md b/pages/common/flex.md
index 8c67c07c09..b48a18274b 100644
--- a/pages/common/flex.md
+++ b/pages/common/flex.md
@@ -9,7 +9,7 @@
 
 - Specify the output file:
 
-`flex {{analyser.l}} --outfile {{analyser.c}}`
+`flex --outfile {{analyser.c}} {{analyser.l}}`
 
 - Compile a C file generated by flex: