diff --git a/docs/internals/contributing/writing-documentation.txt b/docs/internals/contributing/writing-documentation.txt
index cad2b9975e..10f98a89d6 100644
--- a/docs/internals/contributing/writing-documentation.txt
+++ b/docs/internals/contributing/writing-documentation.txt
@@ -414,7 +414,7 @@ AdvanceCOMP's ``advpng``:
    $ advpng -z4 `find . -type f -not -path "./_build/*" -name "*.png"`
 
 This is based on OptiPNG version 0.7.5. Older versions may complain about the
-``--strip all`` option being lossy.
+``-strip all`` option being lossy.
 
 An example
 ==========