diff --git a/include/haproxy/arg-t.h b/include/haproxy/arg-t.h
index cb94ef7ea..57b4080ca 100644
--- a/include/haproxy/arg-t.h
+++ b/include/haproxy/arg-t.h
@@ -83,6 +83,13 @@ enum {
 	ARGC_USRV,     /* use-server message */
 	ARGC_HERR,     /* http-error */
 	ARGC_OT,       /* opentracing scope args */
+	ARGC_TCO,      /* tcp-request connection expression */
+	ARGC_TSE,      /* tcp-request session expression */
+	ARGC_TRQ,      /* tcp-request content expression */
+	ARGC_TRS,      /* tcp-response content expression */
+	ARGC_TCK,      /* tcp-check expression */
+	ARGC_CFG,      /* configuration expression */
+	ARGC_CLI,      /* CLI expression*/
 };
 
 /* flags used when compiling and executing regex */
diff --git a/src/sample.c b/src/sample.c
index b9d90ea0e..a0727d236 100644
--- a/src/sample.c
+++ b/src/sample.c
@@ -1160,8 +1160,8 @@ int smp_resolve_args(struct proxy *p, char **err)
 		case ARGC_TRK:   where = "in tracking rule in"; break;
 		case ARGC_LOG:   where = "in log-format string in"; break;
 		case ARGC_LOGSD: where = "in log-format-sd string in"; break;
-		case ARGC_HRQ:   where = "in http-request header format string in"; break;
-		case ARGC_HRS:   where = "in http-response header format string in"; break;
+		case ARGC_HRQ:   where = "in http-request expression in"; break;
+		case ARGC_HRS:   where = "in http-response response in"; break;
 		case ARGC_UIF:   where = "in unique-id-format string in"; break;
 		case ARGC_RDR:   where = "in redirect format string in"; break;
 		case ARGC_CAP:   where = "in capture rule in"; break;
@@ -1170,6 +1170,13 @@ int smp_resolve_args(struct proxy *p, char **err)
 		case ARGC_SPOE:  where = "in spoe-message directive in"; break;
 		case ARGC_HERR:  where = "in http-error directive in"; break;
 		case ARGC_OT:    where = "in ot-scope directive in"; break;
+		case ARGC_TCO:   where = "in tcp-request connection expression in"; break;
+		case ARGC_TSE:   where = "in tcp-request session expression in"; break;
+		case ARGC_TRQ:   where = "in tcp-request content expression in"; break;
+		case ARGC_TRS:   where = "in tcp-response content expression in"; break;
+		case ARGC_TCK:   where = "in tcp-check expression in"; break;
+		case ARGC_CFG:   where = "in configuration expression in"; break;
+		case ARGC_CLI:   where = "in CLI expression in"; break;
 		}
 
 		/* set a few default settings */