diff --git a/.github/workflows/website.yml b/.github/workflows/website.yml
index a25707e21..0f600de0b 100644
--- a/.github/workflows/website.yml
+++ b/.github/workflows/website.yml
@@ -212,6 +212,19 @@ jobs:
           else
             echo 'const WASM_COMMANDS = ["grep"];' > "$commands_js"
           fi
+          # Record the grep commit used to build its WASM module so the
+          # playground can show it alongside the coreutils build.
+          grep_hash=$(git rev-parse HEAD)
+          grep_short=$(git rev-parse --short HEAD)
+          grep_date=$(git show -s --format=%cI HEAD)
+          {
+            echo "const UUTILS_GREP_VERSION = {"
+            echo "  commit: \"${grep_hash}\","
+            echo "  short: \"${grep_short}\","
+            echo "  date: \"${grep_date}\""
+            echo "};"
+          } >> ../uutils.github.io/static/wasm/version.js
+          echo "grep WASM build: ${grep_short} (${grep_date})"
         fi
 
     - name: Run Zola
diff --git a/content/playground.md b/content/playground.md
index 2c2b74641..30e7f4325 100644
--- a/content/playground.md
+++ b/content/playground.md
@@ -55,6 +55,12 @@ template = "page.html"
         parts.push('Built from uutils/coreutils <a href="' + url + '"><code>' +
           UUTILS_WASM_VERSION.short + '</code></a> (' + date + ')');
       }
+      if (typeof UUTILS_GREP_VERSION !== "undefined") {
+        var grepDate = UUTILS_GREP_VERSION.date.split("T")[0];
+        var grepUrl = "https://github.com/uutils/grep/commit/" + UUTILS_GREP_VERSION.commit;
+        parts.push('grep <a href="' + grepUrl + '"><code>' +
+          UUTILS_GREP_VERSION.short + '</code></a> (' + grepDate + ')');
+      }
       if (typeof SITE_VERSION !== "undefined") {
         var siteDate = SITE_VERSION.date.split("T")[0];
         var siteUrl = "https://github.com/uutils/uutils.github.io/commit/" + SITE_VERSION.commit;