1 files changed, 3 insertions, 0 deletions

diff --git a/doc/pid.n b/doc/pid.n
index 97a42a7..93ca4dc 100644
--- a/doc/pid.n
+++ b/doc/pid.n
@@ -46,3 +46,6 @@ exec(n), open(n)
 
 .SH KEYWORDS
 file, pipeline, process identifier
+
+.SH CATEGORY
+Tcl System Related
\ No newline at end of file