Update documentation parameters

Author: Growl1234

docs/advanced/input_files/input-main.md

@@ -36,6 +36,7 @@
     - [cell\_factor](#cell_factor)
     - [dm\_to\_rho](#dm_to_rho)
     - [chg\_extrap](#chg_extrap)
+    - [wfc\_extrap](#wfc_extrap)
     - [nb2d](#nb2d)
     - [cal\_symm\_repr](#cal_symm_repr)
   - [Input files](#input-files)
@@ -850,6 +851,18 @@
 - **Description**: Charge extrapolation method for MD and relaxation calculations.
 - **Default**: default
 
+### wfc_extrap
+
+- **Type**: String
+- **Description**: Wavefunction extrapolation method for LCAO calculations.
+
+  - none: Disable wavefunction-based extrapolation.
+  - use_prev_wf: Use the previous ionic step wavefunctions as the initial guess.
+
+  This option is currently limited to Gamma-only LCAO calculations.
+  The k-point, ASPC, and GExt_PROJ paths will be enabled by later updates.
+- **Default**: none
+
 ### nb2d
 
 - **Type**: Integer

docs/parameters.yaml

@@ -333,6 +333,20 @@ parameters:
     default_value: default
     unit: ""
     availability: ""
+  - name: wfc_extrap
+    category: System variables
+    type: String
+    description: |
+      Wavefunction extrapolation method for LCAO calculations.
+
+      * none: Disable wavefunction-based extrapolation.
+      * use_prev_wf: Use the previous ionic step wavefunctions as the initial guess.
+
+      This option is currently limited to Gamma-only LCAO calculations.
+      The k-point, ASPC, and GExt_PROJ paths will be enabled by later updates.
+    default_value: none
+    unit: ""
+    availability: ""
   - name: ecutwfc
     category: Plane wave related variables
     type: Real