diff --git a/Documentation/git-credential.txt b/Documentation/git-credential.txt
index f18673017f..ac2818b9f6 100644
--- a/Documentation/git-credential.txt
+++ b/Documentation/git-credential.txt
@@ -160,6 +160,8 @@ empty string.
 Components which are missing from the URL (e.g., there is no
 username in the example above) will be left unset.
 
+Unrecognised attributes are silently discarded.
+
 GIT
 ---
 Part of the linkgit:git[1] suite
diff --git a/Documentation/gitcredentials.txt b/Documentation/gitcredentials.txt
index 6df50e8a14..d6665d2f31 100644
--- a/Documentation/gitcredentials.txt
+++ b/Documentation/gitcredentials.txt
@@ -270,6 +270,7 @@ stdout in the same format (see linkgit:git-credential[1] for common
 attributes). A helper is free to produce a subset, or even no values at
 all if it has nothing useful to provide. Any provided attributes will
 overwrite those already known about by Git's credential subsystem.
+Unrecognised attributes are silently discarded.
 
 While it is possible to override all attributes, well behaving helpers
 should refrain from doing so for any attribute other than username and