diff --git a/lagrange/INSTRUCTIONS.md b/lagrange/INSTRUCTIONS.md
index b9d8bcc..b8a1232 100644
--- a/lagrange/INSTRUCTIONS.md
+++ b/lagrange/INSTRUCTIONS.md
@@ -1,16 +1,18 @@
 # Instructions for Lagrange
 
-Lagrange's trust store is `~/.config/lagrange/trusted.txt` on GNU/Linux systems.
+As of v1.6.0 (2021-07-26), Lagrange's trust store is `~/.config/lagrange/trusted.2.txt` on GNU/Linux and BSD systems.
 
-You can replace it with the generated `trusted.txt`, or merge them using the provided script:
+You can replace it with the generated `trusted.2.txt`, or merge them using the provided script:
 
 ```
 # First a test run:
-./merge-trust-stores.sh ~/.config/lagrange/trusted.txt
+./merge-trust-stores.sh ~/.config/lagrange/trusted.2.txt
 
-# The entries in ~/.config/lagrange/trusted.txt that are not included in the
+# The entries in Lagrange's trust store that are not in the
 # script-generated trust store will appear at the end of the output.
 
 # If it looks ok, then run:
-./merge-trust-stores.sh ~/.config/lagrange/trusted.txt > ~/.config/lagrange/trusted.txt
+./merge-trust-stores.sh ~/.config/lagrange/trusted.2.txt > ~/.config/lagrange/trusted.2.txt
 ```
+
+The script works for both the old `trusted.txt` and the new `trusted.2.txt`.
diff --git a/lagrange/generate-trust-store.sh b/lagrange/generate-trust-store.sh
index 1cfa8c3..3711f16 100755
--- a/lagrange/generate-trust-store.sh
+++ b/lagrange/generate-trust-store.sh
@@ -4,15 +4,19 @@
 # https://gmi.skyjake.fi/lagrange/
 #
 ## Trust store format ##
-# The file "~/.config/lagrange/trusted.txt" is used on GNU/Linux and BSD.
+# The file "~/.config/lagrange/trusted.2.txt" is used on GNU/Linux and BSD.
 # For other platforms, see https://github.com/skyjake/lagrange#user-files
-# This file contains one line for each host (ports are not taken into account):
-# example.org expiry_timestamp cert:sha256
+# This file contains one line for each host:
+# example.org;port expiry_timestamp pubkey:sha256
 # IDNs are converted to punycode.
 #
 ## Example ##
-# $ cat ~/.config/lagrange/trusted.txt
-# gemini.circumlunar.space 1759495837 5b4086d6914231f55828c815faae1f10e28b8bd42af6a1e286a711e9b7d78326
+# $ cat ~/.config/lagrange/trusted2.txt
+# gemini.circumlunar.space;1965 1759495837 5b4086d6914231f55828c815faae1f10e28b8bd42af6a1e286a711e9b7d78326
+#
+# Prior to v1.6.0 (2021-07-26), the file "~/.config/lagrange/trusted.txt"
+# was used, with entries in this format:
+# example.org expiry_timestamp cert:sha256
 
 set -o errexit  # (-e) exit immediately if any command has a non-zero exit status
 set -o nounset  # (-u) don't accept undefined variables
@@ -21,10 +25,11 @@ set -o nounset  # (-u) don't accept undefined variables
 # Go where this script is.
 cd "$(dirname "$0")" || exit
 
-trust_store="trusted.txt"
+trust_store1="trusted.txt"
+trust_store2="trusted.2.txt"  # since v1.6.0 (2021-07-26)
 
-# Remove the old trust store.
-rm -f "$trust_store"
+# Remove the old trust stores.
+rm -f "$trust_store1" "$trust_store2"
 
 # Add the "cert_is_not_within_expiry_boundaries" function.
 . ../expiry-boundaries.sh
@@ -39,6 +44,7 @@ for cert_file in ../certs/*; do
   fi
 
   host=$(expr "$cert_file" : '^../certs\/\(.*\)\:[0-9]*\.pem$')
+  port=$(expr "$cert_file" : '^../certs\/.*\:\([0-9]*\)\.pem$')
 
   # Hostname to punycode.
   host=$(echo "$host" | idn --allow-unassigned)
@@ -48,12 +54,20 @@ for cert_file in ../certs/*; do
   enddate=$(date -d "$enddate" +%s --utc)
 
   # Certificate fingerprint
-  fingerprint=$(echo "$cert" \
+  cert_fingerprint=$(echo "$cert" \
     | openssl x509 -outform der \
     | sha256sum \
     | cut -d ' ' -f 1)
 
-  echo "$host $enddate $fingerprint" >> "$trust_store"
+  # Certificate public key (SPKI) fingerprint
+  pubkey_fingerprint=$(echo "$cert" \
+    | openssl x509 -pubkey -noout \
+    | openssl pkey -pubin -outform der \
+    | sha256sum \
+    | cut -d ' ' -f 1)
+
+  echo "$host $enddate $cert_fingerprint" >> "$trust_store1"
+  echo "$host;$port $enddate $pubkey_fingerprint" >> "$trust_store2"
 
 done
 
diff --git a/lagrange/merge-trust-stores.sh b/lagrange/merge-trust-stores.sh
index 5f86bc1..243270d 100755
--- a/lagrange/merge-trust-stores.sh
+++ b/lagrange/merge-trust-stores.sh
@@ -4,15 +4,23 @@ set -o errexit  # (-e) exit immediately if any command has a non-zero exit statu
 set -o nounset  # (-u) don't accept undefined variables
 #set -o xtrace  # for debugging
 
-if [ -z "${1:-}" ]; then
-  >&2 echo "The path to the user's trust store must be provided."
-  >&2 echo "The default on GNU/Linux is ~/.config/lagrange/trusted.txt"
+input="${1:-}"
+
+if [ -z "$input" ]; then
+  >&2 echo "The path to Lagrange's trust store must be provided."
+  >&2 echo "The default on GNU/Linux is ~/.config/lagrange/trusted.2.txt"
   exit 1
 fi
 
 dir="$(dirname "$0")"  # directory where this script is
 
-trust_store=$(cat "$dir/trusted.txt")  # script-generated trust store
+# Read the script-generated trust store.
+# If input ends with "trusted.txt", then use the old trust store format.
+if echo "$input" | grep -q trusted\\.txt$; then
+  trust_store=$(cat "$dir/trusted.txt")
+else
+  trust_store=$(cat "$dir/trusted.2.txt")
+fi
 
 # Loop through user's trust store.
 while read -r line; do
@@ -24,7 +32,7 @@ while read -r line; do
     trust_store="$trust_store\n$line"
   fi
 
-done < "${1:-}"
+done < "$input"
 
 # Output to stdout.
 echo "$trust_store"