diff --git a/src/mon/OSDMonitor.cc b/src/mon/OSDMonitor.cc
index 7cff9ee9fc0cd..6d7d08f4eeaba 100644
--- a/src/mon/OSDMonitor.cc
+++ b/src/mon/OSDMonitor.cc
@@ -6753,7 +6753,7 @@ int OSDMonitor::prepare_command_pool_set(const cmdmap_t& cmdmap,
 
     if (p.type != pg_pool_t::TYPE_ERASURE) {
       if (n < 1 || n > p.size) {
-	ss << "pool min_size must be between 1 and " << (int)p.size;
+	ss << "pool min_size must be between 1 and size, which is set to " << (int)p.size;
 	return -EINVAL;
       }
     } else {
@@ -6769,7 +6769,7 @@ int OSDMonitor::prepare_command_pool_set(const cmdmap_t& cmdmap,
        }
 
        if (n < k || n > p.size) {
-	 ss << "pool min_size must be between " << k << " and " << (int)p.size;
+	 ss << "pool min_size must be between " << k << " and size, which is set to " << (int)p.size;
 	 return -EINVAL;
        }
     }