diff --git a/tools/imagecon/README.md b/tools/imagecon/README.md
index 04fb46f..047c272 100644
--- a/tools/imagecon/README.md
+++ b/tools/imagecon/README.md
@@ -72,7 +72,7 @@ Generate m68k assembler instructions to install the palette. No symbols are gene
 
 Generate m68k assembler instructions to install a greyscale version of the palette. No symbols are generated. Registers are preserved.
 
-**--extra-half-brite
+**--extra-half-brite**
 
 Generate an extra half brite image. This only works in combination with --colors 32. A 32 color palette will be output, however there will be a sixth bitplane that includes the half brite control bits for any pixels that can use it.