:: commit 0c96d0a973d0a661a004569476cfd9cfceef5c50

diff --git a/CONFIG.md b/CONFIG.md
index a98f7d1b..a473df9f 100644
--- a/CONFIG.md
+++ b/CONFIG.md
@@ -62,8 +62,8 @@ Some keys take *URIs* as values; these are described in the next section.
 * `THEME_MARGIN_GRADIENT` - Set the thickness in pixel for the gradient around the terminal. Ignored if `GRAPHICS` is not `yes`.
 * `BACKGROUND_PATH` - URI where to find the background .BMP file. Ignored if `GRAPHICS` is not `yes`.
 * `STAGE2_MAP` - URI where to find the stage2 symbol map file for stacktraces and symbol name resolution at runtime.
-* `E9_OUTPUT` - Output to port 0xe9 for debugging purposes.
-* `COM1_OUTPUT` - Output to COM1 for debugging purposes.
+* `E9_OUTPUT` - If set to `yes`, output to port 0xe9 for debugging purposes.
+* `COM1_OUTPUT` - If set to `yes`, output to COM1 for debugging purposes.
 
 *Locally assignable (non protocol specific)* keys are:
 * `PROTOCOL` - The boot protocol that will be used to boot the kernel. Valid protocols are: `linux`, `stivale`, `stivale2`, `chainload`.