diff --git a/ex.c b/ex.c
index d718054..6b4d42c 100644
--- a/ex.c
+++ b/ex.c
@@ -215,6 +215,7 @@ launch_cgi(const char *spath, const char *relpath, const char *query,
 		argv[0] = argv[1] = ex;
 
 		safe_setenv("GATEWAY_INTERFACE", "CGI/1.1");
+		safe_setenv("SERVER_PROTOCOL", "GEMINI");
 		safe_setenv("SERVER_SOFTWARE", "gmid");
 		safe_setenv("SERVER_PORT", portno);
 
diff --git a/gmid.1 b/gmid.1
index 95cab4c..e51768c 100644
--- a/gmid.1
+++ b/gmid.1
@@ -192,12 +192,20 @@ the environment from
 .Nm
 with these additional variables set:
 .Bl -tag -width 18m
+.It Ev GATEWAY_INTERFACE
+"CGI/1.1"
+.It Ev SERVER_PROTOCOL
+"GEMINI"
 .It Ev SERVER_SOFTWARE
 "gmid"
 .It Ev SERVER_PORT
 "1965"
+.It Ev SERVER_NAME
+The vhost.
+This variable is not available when operating without a configuration.
 .It Ev SCRIPT_NAME
-The (public) path to the script.
+The (public) path to the script, e.g.
+.Pa "/cgi-bin/example.cgi"
 .It Ev SCRIPT_EXECUTABLE
 The full path to the executable.
 .It Ev REQUEST_URI
@@ -217,11 +225,13 @@ parameter to
 .Nm
 or the root directory of the virtual host.
 .It Ev AUTH_TYPE
-The string "Certificate" if the client used a certificate, otherwise unset.
+The string "Certificate" if the client used a certificate, otherwise
+unset.
 .It Ev REMOTE_USER
 The subject of the client certificate if provided, otherwise unset.
 .It Ev TLS_CLIENT_ISSUER
-The is the issuer of the client certificate if provided, otherwise unset.
+The is the issuer of the client certificate if provided, otherwise
+unset.
 .It Ev TLS_CLIENT_HASH
 The hash of the client certificate if provided, otherwise unset.
 The format is "ALGO:HASH".