spec: minor language/wording improvements
diff --git a/docs/imsi-pseudo-spec.adoc b/docs/imsi-pseudo-spec.adoc
index 17e4476..de178b0 100644
--- a/docs/imsi-pseudo-spec.adoc
+++ b/docs/imsi-pseudo-spec.adoc
@@ -1,4 +1,4 @@
-= Specification for IMSI Pseudonymization on the Radio Interface for 2G and Above
+= Specification for IMSI Pseudonymization on the Radio Interface for 2G/3G/4G
== Introduction
@@ -15,7 +15,7 @@
But this is not enough. So-called IMSI catchers were invented and are used to
not only record IMSIs when they have to be sent. But also to force ME to send
-their IMSI by immitating a Base Transceiver Station (BTS). IMSI catchers have
+their IMSI by imitating a Base Transceiver Station (BTS). IMSI catchers have
become small and affordable, even criminals actors without much budget can use
them to track anybody with a mobile phone.
@@ -156,7 +156,7 @@
[[hlr-imsi-pseudo-i]]
==== imsi_pseudo_i
-The counter imsi_pseudo_i indicates how often a subscriber's pseudonymous IMSI
+The counter imsi_pseudo_i indicates how often a subscribers pseudonymous IMSI
was changed. The value is 1 for the first allocated pseudonymous IMSI of a
subscriber. When allocating a new pseudonymous IMSI for the same subscriber,
the new imsi_pseudo_i value is increased by 1. The counter is used by the SIM