diff --git a/docs/global_substitutions.txt b/docs/global_substitutions.txt
new file mode 100644
index 0000000..242e62c
--- /dev/null
+++ b/docs/global_substitutions.txt
@@ -0,0 +1,55 @@
+.. |AArch32| replace:: :term:`AArch32`
+.. |AArch64| replace:: :term:`AArch64`
+.. |API| replace:: :term:`API`
+.. |CoT| replace:: :term:`CoT`
+.. |COT| replace:: :term:`COT`
+.. |CSS| replace:: :term:`CSS`
+.. |CVE| replace:: :term:`CVE`
+.. |DS-5| replace:: :term:`DS-5`
+.. |DT| replace:: :term:`DT`
+.. |EL| replace:: :term:`EL`
+.. |EHF| replace:: :term:`EHF`
+.. |FDT| replace:: :term:`FDT`
+.. |FIP| replace:: :term:`FIP`
+.. |FVP| replace:: :term:`FVP`
+.. |FWU| replace:: :term:`FWU`
+.. |GIC| replace:: :term:`GIC`
+.. |ISA| replace:: :term:`ISA`
+.. |Linaro| replace:: :term:`Linaro`
+.. |MMU| replace:: :term:`MMU`
+.. |MPAM| replace:: :term:`MPAM`
+.. |MPIDR| replace:: :term:`MPIDR`
+.. |OEN| replace:: :term:`OEN`
+.. |OP-TEE| replace:: :term:`OP-TEE`
+.. |OTE| replace:: :term:`OTE`
+.. |PDD| replace:: :term:`PDD`
+.. |PMF| replace:: :term:`PMF`
+.. |PSCI| replace:: :term:`PSCI`
+.. |RAS| replace:: :term:`RAS`
+.. |ROT| replace:: :term:`ROT`
+.. |SCMI| replace:: :term:`SCMI`
+.. |SCP| replace:: :term:`SCP`
+.. |SDEI| replace:: :term:`SDEI`
+.. |SDS| replace:: :term:`SDS`
+.. |SEA| replace:: :term:`SEA`
+.. |SiP| replace:: :term:`SiP`
+.. |SIP| replace:: :term:`SIP`
+.. |SMC| replace:: :term:`SMC`
+.. |SMCCC| replace:: :term:`SMCCC`
+.. |SoC| replace:: :term:`SoC`
+.. |SP| replace:: :term:`SP`
+.. |SPD| replace:: :term:`SPD`
+.. |SPM| replace:: :term:`SPM`
+.. |SVE| replace:: :term:`SVE`
+.. |TBB| replace:: :term:`TBB`
+.. |TBBR| replace:: :term:`TBBR`
+.. |TEE| replace:: :term:`TEE`
+.. |TF-A| replace:: :term:`TF-A`
+.. |TF-M| replace:: :term:`TF-M`
+.. |TLB| replace:: :term:`TLB`
+.. |TLK| replace:: :term:`TLK`
+.. |TSP| replace:: :term:`TSP`
+.. |TZC| replace:: :term:`TZC`
+.. |UEFI| replace:: :term:`UEFI`
+.. |WDOG| replace:: :term:`WDOG`
+.. |XLAT| replace:: :term:`XLAT`
\ No newline at end of file