update comment

Author: emilykl

test/jasmine/karma.conf.js

@@ -261,10 +261,11 @@ func.defaultConfig = {
                 '--touch-events',
                 '--window-size=' + argv.width + ',' + argv.height,
                 isCI ? '--ignore-gpu-blocklist' : '',
-                // The following three flags are needed only for the "NoCI" tests which run in GitHub Actions.
-                // The first two are needed because the GPU is not available to those runners,
-                // and therefore we need to use SwiftShader instead.
-                // The third flag is needed because the Chrome browser installed by the CI job runner
+                // The following two flags are needed only for the "NoCI" tests which run in GitHub Actions.
+                // The first is needed because the GPU is not available to those runners,
+                // and therefore we need to use SwiftShader instead (which is disabled by default as of Jan 2026,
+                // hence the need for a flag to manually enable it).
+                // The second flag is needed because the Chrome browser installed by the CI job runner
                 // fails without it.
                 isCI && process.env.GITHUB_ACTIONS ? '--enable-unsafe-swiftshader' : '',
                 isCI && process.env.GITHUB_ACTIONS ? '--no-sandbox' : '',