diff --git a/include/haproxy/action.h b/include/haproxy/action.h
index eed440d8e..8a35664f4 100644
--- a/include/haproxy/action.h
+++ b/include/haproxy/action.h
@@ -114,5 +114,6 @@ static inline void release_timeout_action(struct act_rule *rule)
 
 struct act_rule *new_act_rule(enum act_from from, const char *file, int linenum);
 void free_act_rules(struct list *rules);
+void dump_act_rules(const struct list *rules, const char *pfx);
 
 #endif /* _HAPROXY_ACTION_H */
diff --git a/src/action.c b/src/action.c
index 74f5387b9..4ee23c547 100644
--- a/src/action.c
+++ b/src/action.c
@@ -321,3 +321,28 @@ void free_act_rules(struct list *rules)
 		free_act_rule(rule);
 	}
 }
+
+/* dumps all known actions registered in action rules <rules> after prefix
+ * <pfx> to stdout. The actions are alphabetically sorted. Those with the
+ * KWF_MATCH_PREFIX flag have their name suffixed with '*'.
+ */
+void dump_act_rules(const struct list *rules, const char *pfx)
+{
+	const struct action_kw *akwp, *akwn;
+	struct action_kw_list *akwl;
+	int index;
+
+	for (akwn = akwp = NULL;; akwp = akwn) {
+		list_for_each_entry(akwl, rules, list) {
+			for (index = 0; akwl->kw[index].kw != NULL; index++)
+				if (strordered(akwp ? akwp->kw : NULL,
+					       akwl->kw[index].kw,
+					       akwn != akwp ? akwn->kw : NULL))
+					akwn = &akwl->kw[index];
+		}
+		if (akwn == akwp)
+			break;
+		printf("%s%s%s\n", pfx ? pfx : "", akwn->kw,
+		       (akwn->flags & KWF_MATCH_PREFIX) ? "*" : "");
+	}
+}