diff --git a/.gitmodules b/.gitmodules
index 6b1cff40..d619f27a 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -185,3 +185,6 @@
 [submodule "assets/syntaxes/02_Extra/AsciiDoc"]
 	path = assets/syntaxes/02_Extra/AsciiDoc
 	url = https://github.com/asciidoctor/sublimetext-asciidoc.git
+[submodule "assets/syntaxes/02_Extra/GLSL"]
+	path = assets/syntaxes/02_Extra/GLSL
+	url = https://github.com/euler0/sublime-glsl
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bfd57e69..5a168c47 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 ## Syntaxes
 
 - Update AsciiDoc syntax, see #1034 (@rxt1077)
+- GLSL (@caioalonso)
 
 ## New themes
 ## `bat` as a library
diff --git a/assets/syntaxes/02_Extra/GLSL b/assets/syntaxes/02_Extra/GLSL
new file mode 160000
index 00000000..4cd4acff
--- /dev/null
+++ b/assets/syntaxes/02_Extra/GLSL
@@ -0,0 +1 @@
+Subproject commit 4cd4acfffc7f2ab4f154b6ebfbbe0bb71825eb89
diff --git a/src/assets.rs b/src/assets.rs
index 86c3fe0b..b30fa3b7 100644
--- a/src/assets.rs
+++ b/src/assets.rs
@@ -428,6 +428,7 @@ mod tests {
         assert_eq!(test.syntax_for_file("test.h"), "C++");
         assert_eq!(test.syntax_for_file("test.sass"), "Sass");
         assert_eq!(test.syntax_for_file("test.js"), "JavaScript (Babel)");
+        assert_eq!(test.syntax_for_file("test.fs"), "F#");
     }
 
     #[test]
diff --git a/src/syntax_mapping.rs b/src/syntax_mapping.rs
index 0b1feb82..0b65ae65 100644
--- a/src/syntax_mapping.rs
+++ b/src/syntax_mapping.rs
@@ -23,6 +23,7 @@ impl<'a> SyntaxMapping<'a> {
     pub fn builtin() -> SyntaxMapping<'a> {
         let mut mapping = Self::empty();
         mapping.insert("*.h", MappingTarget::MapTo("C++")).unwrap();
+        mapping.insert("*.fs", MappingTarget::MapTo("F#")).unwrap();
         mapping
             .insert("build", MappingTarget::MapToUnknown)
             .unwrap();
diff --git a/tests/no_duplicate_extensions.rs b/tests/no_duplicate_extensions.rs
index 2f3b5c08..3f2f1460 100644
--- a/tests/no_duplicate_extensions.rs
+++ b/tests/no_duplicate_extensions.rs
@@ -14,6 +14,8 @@ fn no_duplicate_extensions() {
         // The "Ruby Haml" syntax also comes with a '.sass' extension. However, we make sure
         // that 'sass' is mapped to the 'Sass' syntax.
         "sass",
+        // The '.fs' extension appears in F# and GLSL. We default to F#.
+        "fs",
     ];
 
     let assets = HighlightingAssets::from_binary();