diff --git a/configuration/README.md b/configuration/README.md
index f16c4209..1bbd6441 100644
--- a/configuration/README.md
+++ b/configuration/README.md
@@ -70,6 +70,7 @@ These variables are optional that can be specified in the design configuration f
 | `TOP_MARGIN_MULT`        | The core margin, in multiples of site heights, from the top boundary. <br> (Default: `4`) |
 | `LEFT_MARGIN_MULT`       | The core margin, in multiples of site widths, from the left boundary.  <br> (Default: `12`) |
 | `RIGHT_MARGIN_MULT`      | The core margin, in multiples of site widths, from the right boundary.   <br> (Default: `12`) |
+| `FP_PDN_CORE_RING` | Enables adding a core ring around the design. More details on the control variables in the pdk configurations documentation. 0=Disable 1=Enable. <br> (Default: `0`) |  
 
 ### Placement
 
diff --git a/configuration/floorplan.tcl b/configuration/floorplan.tcl
index 15a6b226..c41d1b04 100644
--- a/configuration/floorplan.tcl
+++ b/configuration/floorplan.tcl
@@ -26,6 +26,8 @@ set ::env(FP_PDN_VPITCH) 153.6
 set ::env(FP_PDN_HOFFSET) 16.65
 set ::env(FP_PDN_HPITCH) 153.18
 
+set ::env(FP_PDN_CORE_RING) 0
+
 set ::env(FP_IO_MODE) 1; # 0 matching mode - 1 random equidistant mode
 set ::env(FP_IO_HLENGTH) 4
 set ::env(FP_IO_VLENGTH) 4
diff --git a/doc/PDK_STRUCTURE.md b/doc/PDK_STRUCTURE.md
index 5c77b625..39c4dcf7 100644
--- a/doc/PDK_STRUCTURE.md
+++ b/doc/PDK_STRUCTURE.md
@@ -49,8 +49,13 @@ This section defines the neccessary variables for PDK configuration file
 | `CTS_SQR_RES` | Defines the resistance per square micron, used in CTS. |
 | `FP_PDN_RAIL_OFFSET` | Defines the rail offset for met1 used in PDN. <br> Default: `0`. |
 | `FP_PDN_VWIDTH` | Defines the strap width for the vertical layer used in PDN. <br> Default: `1.6`. |
-| `FP_PDN_HWIDTH` | Defines the strap width for the vertical layer used in PDN. <br> Default: `1.6`. |
-
+| `FP_PDN_HWIDTH` | Defines the strap width for the horizontal layer used in PDN. <br> Default: `1.6`. |
+| `FP_PDN_CORE_RING_VWIDTH` | Defines the vertical width for the vertical layer used to create the core ring in the PDN. <br> Default: `20`. |
+| `FP_PDN_CORE_RING_HWIDTH` | Defines the horizontal width for the horizontal layer used to create the core ring in the PDN. <br> Default: `20`. |
+| `FP_PDN_CORE_RING_VSPACING` | Defines the spacing for the vertical layer used to create the core ring in the PDN. <br> Default: `5`. |
+| `FP_PDN_CORE_RING_HSPACING` | Defines the spacing for the horizontal layer used to create the core ring in the PDN. <br> Default: `5`. |
+| `FP_PDN_CORE_RING_VOFFSET` | Defines the offset for the vertical layer used to create the core ring in the PDN. <br> Default: `20`. |
+| `FP_PDN_CORE_RING_HOFFSET` | Defines the offset for the horizontal layer used to create the core ring in the PDN. <br> Default: `20`. |
 
 ## Standard cell library-specific variables