diff --git a/doc/source/shared/abbrevs.txt b/doc/source/shared/abbrevs.txt
index 721bd033a..c7bd739af 100755
--- a/doc/source/shared/abbrevs.txt
+++ b/doc/source/shared/abbrevs.txt
@@ -106,13 +106,14 @@
 .. |O-RAN| replace:: :abbr:`O-RAN (Open Radio Access Network)`
 .. |PAC| replace:: :abbr:`PAC (Programmable Acceleration Card)`
 .. |PCI| replace:: :abbr:`PCI (Peripheral Component Interconnect)`
-.. |PCIe| replace:: :abbr:`PCI (Peripheral Component Interconnect extended)`
+.. |PCIe| replace:: :abbr:`PCIe (Peripheral Component Interconnect extended)`
 .. |PDU| replace:: :abbr:`PDU (Packet Data Unit)`
 .. |PEM| replace:: :abbr:`PEM (Privacy Enhanced Mail)`
 .. |PF| replace:: :abbr:`PF (Physical Function)`
 .. |PHB| replace:: :abbr:`PHB (Per-Hop Behavior)`
 .. |PHC| replace:: :abbr:`PHC (PTP Hardware Clock)`
-.. |PHCs| replace:: :abbr:`PHC (PTP Hardware Clock)`
+.. |PHCs| replace:: :abbr:`PHCs (PTP Hardware Clocks)`
+.. |PMC| replace:: :abbr:`PMC (PTP Management Client)`
 .. |PMD| replace:: :abbr:`PMD (Pole Mode Driver)`
 .. |PQDN| replace:: :abbr:`PDQN (Partially Qualified Domain Name)`
 .. |PQDNs| replace:: :abbr:`PQDNs (Partially Qualified Domain Names)`