diff --git a/Build/Changes.txt b/Build/Changes.txt
index 2c9882409..03d0e47ea 100644
--- a/Build/Changes.txt
+++ b/Build/Changes.txt
@@ -41,6 +41,7 @@ Current BETA Version 6.25.1021.(build_#) (2025-10-21)
 NEW:
 --------------------------------------------------------
 [.###.#]- .
+[1021.2]- Add extensions "ts"and "tsx" in Tcl Script lexer (LEX).
 [1021.1]- Add extension "JSX" in JavaScript lexer (LEX).
 [.828.1]- Added Notepad3 Version in the Title bar of the Inno Setup dialog box (SUP).
 
diff --git a/Build/Themes/Dark.ini b/Build/Themes/Dark.ini
index 544df612b..f459ce2c6 100644
--- a/Build/Themes/Dark.ini
+++ b/Build/Themes/Dark.ini
@@ -647,7 +647,7 @@ String=fore:#008080
 Identifier=fore:#800080
 Substitution=fore:#CC0000
 Modifier=fore:#FF00FF
-FileNameExtensions=tcl; itcl; tm
+FileNameExtensions=tcl; itcl; tm; ts; tsx
 [TOML Config]
 Keyword=bold; fore:#FF0080
 Comment=fore:#008000
diff --git a/Build/Themes/Obsidian.ini b/Build/Themes/Obsidian.ini
index 590d15890..530f1ba30 100644
--- a/Build/Themes/Obsidian.ini
+++ b/Build/Themes/Obsidian.ini
@@ -648,7 +648,7 @@ String=fore:#008080
 Identifier=fore:#800080
 Substitution=fore:#CC0000
 Modifier=fore:#FF00FF
-FileNameExtensions=tcl; itcl; tm
+FileNameExtensions=tcl; itcl; tm; ts; tsx
 [TOML Config]
 Keyword=bold; fore:#FF0080
 Comment=fore:#008000
diff --git a/Build/Themes/Sombra.ini b/Build/Themes/Sombra.ini
index 6b8f372de..748c0fb68 100644
--- a/Build/Themes/Sombra.ini
+++ b/Build/Themes/Sombra.ini
@@ -660,7 +660,7 @@ String=fore:#00AFAA
 Identifier=fore:#FF35FF
 Substitution=fore:#FF1926
 Modifier=fore:#A005A0
-FileNameExtensions=tcl; itcl; tm
+FileNameExtensions=tcl; itcl; tm; ts; tsx
 [TOML Config]
 Keyword=bold; fore:#CB0965
 Comment=fore:#00CB00
diff --git a/Build/minipath.ini b/Build/minipath.ini
index f9e034e59..41356ff74 100644
--- a/Build/minipath.ini
+++ b/Build/minipath.ini
@@ -98,7 +98,7 @@ Ruby Script=*.rb;*.ruby;*.rbw;*.rake;*.rjs;*.rakefile;*.gemspec;*.podspec
 ;Shell Script=*.sh;*.csh;*.zsh;*.bash;*.tcsh;*.m4;*.in
 ;SQL Query=*.sql;*.mysql;*.hsql;*.pkb
 ;SystemVerilog HDVL=*.sv;*.svh
-;Tcl Script=*.tcl;*.itcl;*.tm
+;Tcl Script=*.tcl;*.itcl;*.tm;*.ts;*.tsx
 ;TOML Config=*.toml
 ;VBScript=*.vbs;*.dsm
 ;Verilog HDL=*.v;*.vh
diff --git a/src/StyleLexers/styleLexTCL.c b/src/StyleLexers/styleLexTCL.c
index d3ca11751..bd899999c 100644
--- a/src/StyleLexers/styleLexTCL.c
+++ b/src/StyleLexers/styleLexTCL.c
@@ -33,7 +33,7 @@ KEYWORDLIST KeyWords_TCL =
 
 EDITLEXER lexTCL =
 {
-    SCLEX_TCL, "tcl", IDS_LEX_TCL, L"Tcl Script", L"tcl; itcl; tm", L"",
+    SCLEX_TCL, "tcl", IDS_LEX_TCL, L"Tcl Script", L"tcl; itcl; tm; ts; tsx", L"",
     &KeyWords_TCL, {
         { {STYLE_DEFAULT}, IDS_LEX_STR_Default, L"Default", L"", L"" },
         //{ {SCE_TCL_DEFAULT}, IDS_LEX_STR_Default, L"Default", L"", L"" },