diff --git a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
index 58c41eba30cff6bcdbf237f833ec7debb6b0aca8..1a3816a2c27bc1ba8bb4c8cfbeb831bd2d99d9e6 100644
--- a/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
+++ b/src/sksl/codegen/SkSLGLSLCodeGenerator.cpp
@@ -1704,6 +1704,7 @@ void GLSLCodeGenerator::writeInputVars() {
 
 bool GLSLCodeGenerator::generateCode() {
     this->writeHeader();
+    this->writeLine("// GL_EXTENSION_SKIA_CACHE");
     OutputStream* rawOut = fOut;
     StringStream body;
     fOut = &body;