diff --git a/doc_src/index.hdr.in b/doc_src/index.hdr.in
index 1e8c5c89e..39c799b18 100644
--- a/doc_src/index.hdr.in
+++ b/doc_src/index.hdr.in
@@ -1181,6 +1181,9 @@ cursor when the search began.
 
 History searches can be aborted by pressing the escape key.
 
+Prefixing the commandline with a space will prevent the entire line
+from being stored in the history.
+
 The history is stored in the file '~/.config/fish/fish_history'. It is automatically
 read on startup and merged on program exit.