diff --git a/pages/common/gemtopnm.md b/pages/common/gemtopnm.md
index 9a27313ada..3e5892ff43 100644
--- a/pages/common/gemtopnm.md
+++ b/pages/common/gemtopnm.md
@@ -9,7 +9,7 @@
 
 - Describe the contents of the specified GEM image:
 
-`gemtopnm -d {{path/to/file.img}}`
+`gemtopnm {{[-d|-debug]}} {{path/to/file.img}}`
 
 - Display version:
 
diff --git a/pages/common/thinkjettopbm.md b/pages/common/thinkjettopbm.md
index 656bc2203d..7513a667dc 100644
--- a/pages/common/thinkjettopbm.md
+++ b/pages/common/thinkjettopbm.md
@@ -9,4 +9,4 @@
 
 - Print debug information to `stderr`:
 
-`thinkjettopbm -d {{path/to/input}} > {{path/to/output.pbm}}`
+`thinkjettopbm {{[-d|-debug]}} {{path/to/input}} > {{path/to/output.pbm}}`