diff --git a/src/init.cpp b/src/init.cpp
index b68c8bb20bb..3930e31316f 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -521,7 +521,7 @@ void SetupServerArgs(ArgsManager& argsman, bool can_listen_ipc)
                    ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-fastprune", "Use smaller block files and lower minimum prune height for testing purposes", ArgsManager::ALLOW_ANY | ArgsManager::DEBUG_ONLY, OptionsCategory::DEBUG_TEST);
 #if HAVE_SYSTEM
-    argsman.AddArg("-blocknotify=<cmd>", "Execute command when the best block changes (%s in cmd is replaced by block hash)", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
+    argsman.AddArg("-blocknotify=<cmd>", "Execute command when the best block changes (%s in cmd is replaced by block hash). Not run for blocks connected during initial block download or reindexing.", ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
 #endif
     argsman.AddArg("-blockreconstructionextratxn=<n>", strprintf("Extra transactions to keep in memory for compact block reconstructions (default: %u)", DEFAULT_BLOCK_RECONSTRUCTION_EXTRA_TXN), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);
     argsman.AddArg("-blocksonly", strprintf("Whether to reject transactions from network peers. Disables automatic broadcast and rebroadcast of transactions, unless the source peer has the 'forcerelay' permission. RPC transactions are not affected. (default: %u)", DEFAULT_BLOCKSONLY), ArgsManager::ALLOW_ANY, OptionsCategory::OPTIONS);