man-pages version: latest git repository
why: Just a typo. There's no flag named SECURE_KEEP_CAPS.

diff --git a/man7/capabilities.7 b/man7/capabilities.7
--- a/man7/capabilities.7
+++ b/man7/capabilities.7

@@ -845,7 +845,7 @@ flags are inherited by child processes.

During an
.BR execve (2),
all of the flags are preserved, except
-.B SECURE_KEEP_CAPS
+.B SECBIT_KEEP_CAPS
which is always cleared.

An application can use the following call to lock itself,

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