diff --git a/src/ifp/README.md b/src/ifp/README.md
index 298d5e9c1d2..4dcf6b3a982 100644
--- a/src/ifp/README.md
+++ b/src/ifp/README.md
@@ -64,7 +64,7 @@ initialize_floorplan
 | Switch Name | Description |
 | ----- | ----- |
 | `-core_area` | Core area coordinates in microns (lower left x/y and upper right x/y coordinates). |
-| `-core_space` | Space around the core, default `0.0` microns. Allowed values are either one value for all margins or a set of four values, one for each margin. The order of the four values are: `{bottom top left right}`. |
+| `-core_space` | Space around the core in microns. Allowed values are either one value for all margins or a set of four values, one for each margin. The order of the four values are: `{bottom top left right}`. |
 | `-die_area` | Die area coordinates in microns (lower left x/y and upper right x/y coordinates). |
 | `-site` | Site name. |
 | `-utilization` | Percentage utilization. Allowed values are `double` in the range `(0-100]`. |