diff --git a/language/common_res.h b/language/common_res.h
index 1a03c155a..255387e2f 100644
--- a/language/common_res.h
+++ b/language/common_res.h
@@ -474,6 +474,7 @@
 #define IDC_MODLNS_CNTLN1_ZEROFLD       203
 #define IDC_MODLNS_CNTLN0_CANONIC       204
 #define IDC_MODLNS_CNTLN0_ZEROFLD       205
+#define IDC_MODLNS_TINYEXPR_ALL         206
 
 #define CMD_ESCAPE                      20000
 #define CMD_SHIFTESC                    20001
diff --git a/language/np3_de_de/dialogs_de_de.rc b/language/np3_de_de/dialogs_de_de.rc
index d9f487663..4d941c4b7 100644
--- a/language/np3_de_de/dialogs_de_de.rc
+++ b/language/np3_de_de/dialogs_de_de.rc
@@ -510,7 +510,7 @@ BEGIN
     PUSHBUTTON      "Abbrechen",IDCANCEL,73,24,50,14
 END
 
-IDD_MUI_MODIFYLINES DIALOGEX 0, 0, 182, 110
+IDD_MUI_MODIFYLINES DIALOGEX 0, 0, 182, 120
 STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
 CAPTION "Zeilen Modifizieren"
 FONT 9, "Segoe UI", 0, 0, 0x0
@@ -530,6 +530,8 @@ BEGIN
     LTEXT           "${I}",IDC_MODLNS_CNTLN0_CANONIC,7,92,13,8
     LTEXT           "${0I}",IDC_MODLNS_CNTLN0_ZEROFLD,30,92,17,8
     LTEXT           "Fortlaufende (mit 0 beginnend).",IDC_STATIC5,57,92,120,8
+    LTEXT           "${0L+I+N}", IDC_MODLNS_TINYEXPR_ALL,12,102,30,8
+    LTEXT           "${<expr>} definiert Math-Ausdrücke.",IDC_STATIC5,57,102,175,8
 END
 
 IDD_MUI_INSERTTAG DIALOGEX 0, 0, 182, 70
diff --git a/language/np3_en_us/dialogs_en_us.rc b/language/np3_en_us/dialogs_en_us.rc
index fa440ed49..e4edf1f2b 100644
--- a/language/np3_en_us/dialogs_en_us.rc
+++ b/language/np3_en_us/dialogs_en_us.rc
@@ -510,7 +510,7 @@ BEGIN
     PUSHBUTTON      "Cancel",IDCANCEL,73,24,50,14
 END
 
-IDD_MUI_MODIFYLINES DIALOGEX 0, 0, 182, 110
+IDD_MUI_MODIFYLINES DIALOGEX 0, 0, 182, 120
 STYLE DS_SETFONT | DS_MODALFRAME | DS_FIXEDSYS | WS_POPUP | WS_CAPTION | WS_SYSMENU
 CAPTION "Modify Lines"
 FONT 9, "Segoe UI", 0, 0, 0x0
@@ -530,6 +530,8 @@ BEGIN
     LTEXT           "${I}",IDC_MODLNS_CNTLN0_CANONIC,7,92,13,8
     LTEXT           "${0I}",IDC_MODLNS_CNTLN0_ZEROFLD,30,92,17,8
     LTEXT           "Continuous number (zero-based).",IDC_STATIC5,57,92,109,8
+    LTEXT           "${0L+I+N}", IDC_MODLNS_TINYEXPR_ALL,12,102,30,8
+    LTEXT           "${<expr>} defines math formulas.",IDC_STATIC5,57,102,175,8
 END
 
 IDD_MUI_INSERTTAG DIALOGEX 0, 0, 182, 70
diff --git a/src/Edit.c b/src/Edit.c
index 7458e952f..a314b1cd2 100644
--- a/src/Edit.c
+++ b/src/Edit.c
@@ -8548,7 +8548,7 @@ static INT_PTR CALLBACK EditModifyLinesDlgProc(HWND hwnd, UINT umsg, WPARAM wPar
             DWORD const dwId = GetWindowLong((HWND)lParam, GWL_ID);
             HDC const hdc = (HDC)wParam;
             INT_PTR const hbrReturn = SetDarkModeCtlColors(hdc, UseDarkMode());
-            if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_CNTLN0_ZEROFLD) {
+            if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_TINYEXPR_ALL) {
                 SetBkMode(hdc, TRANSPARENT);
                 if (GetSysColorBrush(COLOR_HOTLIGHT)) {
                     SetTextColor(hdc, GetSysColor(COLOR_HOTLIGHT));
@@ -8595,7 +8595,7 @@ static INT_PTR CALLBACK EditModifyLinesDlgProc(HWND hwnd, UINT umsg, WPARAM wPar
         DWORD dwId = (DWORD)GetWindowLong(hwndHover,GWL_ID);
 
         if (GetActiveWindow() == hwnd) {
-            if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_CNTLN0_ZEROFLD) {
+            if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_TINYEXPR_ALL) {
                 if (id_capture == (int)dwId || id_capture == 0) {
                     if (id_hover != id_capture || id_hover == 0) {
                         id_hover = (int)dwId;
@@ -8618,7 +8618,7 @@ static INT_PTR CALLBACK EditModifyLinesDlgProc(HWND hwnd, UINT umsg, WPARAM wPar
         HWND hwndHover = ChildWindowFromPoint(hwnd,pt);
         DWORD dwId = GetWindowLong(hwndHover,GWL_ID);
 
-        if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_CNTLN0_ZEROFLD) {
+        if (dwId >= IDC_MODLNS_DOCLN_CANONIC && dwId <= IDC_MODLNS_TINYEXPR_ALL) {
             GetCapture();
             id_hover = dwId;
             id_capture = dwId;
@@ -8637,7 +8637,7 @@ static INT_PTR CALLBACK EditModifyLinesDlgProc(HWND hwnd, UINT umsg, WPARAM wPar
             if (id_hover == id_capture) {
                 int id_focus = GetWindowLong(GetFocus(),GWL_ID);
                 if (id_focus == IDC_MODLNS_ED_PREPEND || id_focus == IDC_MODLNS_ED_APPEND) {
-                    WCHAR wch[8];
+                    WCHAR wch[64];
                     GetDlgItemText(hwnd,id_capture,wch,COUNTOF(wch));
                     SendDlgItemMessage(hwnd,id_focus,EM_SETSEL,(WPARAM)0,(LPARAM)-1);
                     SendDlgItemMessage(hwnd,id_focus,EM_REPLACESEL,(WPARAM)true,(LPARAM)wch);