diff --git a/src/application.cpp b/src/application.cpp
index 41a8122..57364d2 100644
--- a/src/application.cpp
+++ b/src/application.cpp
@@ -122,6 +122,7 @@ GitApp::GitApp(cppcms::service &srv, const RepoScanner *scanner)
     allow_clone_ = resolve_allow_clone(settings().get<bool>("git.allow_clone", false));
 
     // Root arrives as "" because script_name "/" is stripped; accept both.
+    dispatcher().assign(R"(^/robots\.txt$)", &GitApp::robots_txt, this);
     dispatcher().assign("^/?$", &GitApp::frontpage, this);
     dispatcher().assign("^/about/?$", &GitApp::about, this);
     dispatcher().assign("^/static/(.+)$", &GitApp::static_file, this, 1);
@@ -131,10 +132,10 @@ GitApp::GitApp(cppcms::service &srv, const RepoScanner *scanner)
     dispatcher().assign("^/repos/([^/]+)/blame/(.+)$", &GitApp::blame, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/object/([0-9a-f]+)$", &GitApp::object, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/log/?$", &GitApp::log, this, 1);
-    dispatcher().assign("^/repos/([^/]+)/commit/([0-9a-f]+)\\.patch$", &GitApp::commit_patch, this, 1, 2);
+    dispatcher().assign(R"(^/repos/([^/]+)/commit/([0-9a-f]+)\.patch$)", &GitApp::commit_patch, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/commit/([0-9a-f]+)$", &GitApp::commit, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/tags/?$", &GitApp::tags, this, 1);
-    dispatcher().assign("^/repos/([^/]+)/tags/(.+)\\.tar\\.gz$", &GitApp::tag_archive, this, 1, 2);
+    dispatcher().assign(R"(^/repos/([^/]+)/tags/(.+)\.tar\.gz$)", &GitApp::tag_archive, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/tags/(.+)$", &GitApp::tag, this, 1, 2);
     dispatcher().assign("^/repos/([^/]+)/branches/?$", &GitApp::branches, this, 1);
     // Only wire up the clone endpoints when enabled, so a disabled server never
@@ -160,6 +161,13 @@ void GitApp::main(std::string url) {
     cppcms::application::main(url);
 }
 
+void GitApp::robots_txt() {
+    response().content_type("text/plain; charset=utf-8");
+    response().out() << "User-agent: *\n"
+                        "Disallow: /repos/*/blame/\n"
+                        "Allow: /\n";
+}
+
 void GitApp::static_file(std::string rel) {
     if (rel.find("..") != std::string::npos) {
         show_error(403, "Forbidden");
diff --git a/src/application.h b/src/application.h
index a606504..338cfc3 100644
--- a/src/application.h
+++ b/src/application.h
@@ -60,6 +60,7 @@ private:
     void branches(std::string name);
     void commit(std::string name, std::string oid);
     void commit_patch(std::string name, std::string oid);
+    void robots_txt();
     void static_file(std::string rel);
 
     // Serves Git's Smart HTTP protocol (clone/fetch) by proxying to