diff --git a/src/timezone/tznames/Antarctica.txt b/src/timezone/tznames/Antarctica.txt
index 709f6c023b..413b928ccf 100644
--- a/src/timezone/tznames/Antarctica.txt
+++ b/src/timezone/tznames/Antarctica.txt
@@ -13,7 +13,7 @@ AWST    28800    # Australian Western Standard Time
 CLST   -10800 D  # Chile Summer Time (obsolete)
 CLT    America/Santiago  # Chile Time (obsolete)
 DAVT    Antarctica/Davis  # Davis Time (Antarctica) (obsolete)
-DDUT    36000    # Dumont-d`Urville Time (Antarctica) (obsolete)
+DDUT    36000    # Dumont-d'Urville Time (Antarctica) (obsolete)
 MAWT    Antarctica/Mawson  # Mawson Time (Antarctica) (obsolete)
 MIST    39600    # Macquarie Island Time (obsolete)
 NZDT    46800 D  # New Zealand Daylight Time
diff --git a/src/timezone/tznames/Australia.txt b/src/timezone/tznames/Australia.txt
index 01629de72a..da90866d18 100644
--- a/src/timezone/tznames/Australia.txt
+++ b/src/timezone/tznames/Australia.txt
@@ -7,7 +7,7 @@
 # src/timezone/tznames/Australia.txt
 #
 
-ACSST   37800 D  # Central Australia (not in IANA database)
+ACSST   37800 D  # Australian Central Summer Standard Time (not in IANA database)
 ACDT    37800 D  # Australian Central Daylight Time
                  #     (Australia/Adelaide)
                  #     (Australia/Broken_Hill)
@@ -17,7 +17,7 @@ ACST    34200    # Australian Central Standard Time
                  #     (Australia/Broken_Hill)
                  #     (Australia/Darwin)
 ACWST   31500    # Australian Central Western Standard Time (obsolete)
-AESST   39600 D  # Australia Eastern Summer Standard Time (not in IANA database)
+AESST   39600 D  # Australian Eastern Summer Standard Time (not in IANA database)
 AEDT    39600 D  # Australian Eastern Daylight Time
                  #     (Australia/Brisbane)
                  #     (Australia/Currie)
diff --git a/src/timezone/tznames/Default b/src/timezone/tznames/Default
index 1532413bfa..8a4dc59f88 100644
--- a/src/timezone/tznames/Default
+++ b/src/timezone/tznames/Default
@@ -597,8 +597,8 @@ CHUT    36000    # Chuuk Time (obsolete)
 CKT     Pacific/Rarotonga  # Cook Islands Time (obsolete)
 EASST   Pacific/Easter  # Easter Island Summer Time (obsolete)
 EAST    Pacific/Easter  # Easter Island Time (Chile) (obsolete)
-FJST    46800 D  # Fiji Summer Time (obsolete)
-FJT     43200    # Fiji Time (obsolete)
+FJST    46800 D  # Fiji Summer Time (caution: this used to mean -46800) (obsolete)
+FJT     43200    # Fiji Time (caution: this used to mean -43200) (obsolete)
 GALT   -21600    # Galapagos Time (obsolete)
 GAMT   -32400    # Gambier Time (obsolete)
 GILT    43200    # Gilbert Islands Time (obsolete)
diff --git a/src/timezone/tznames/Europe.txt b/src/timezone/tznames/Europe.txt
index 86378bf8e9..2e762b9070 100644
--- a/src/timezone/tznames/Europe.txt
+++ b/src/timezone/tznames/Europe.txt
@@ -12,6 +12,7 @@
 #  - BST: Bougainville Standard Time (Papua New Guinea)
 BST      3600 D  # British Summer Time
                  #     (Europe/London)
+BDST     7200 D  # British Double Summer Time
 CEST     7200 D  # Central Europe Summer Time
                  #     (Africa/Ceuta)
                  #     (Europe/Amsterdam)
@@ -184,12 +185,12 @@ IST      3600    # Irish Standard Time
                  #     (Europe/Dublin)
 MEST     7200 D  # Middle Europe Summer Time
                  #     (MET)
-MESZ     7200 D  # Mitteleuropäische Sommerzeit (German)
+MESZ     7200 D  # Mitteleuropaeische Sommerzeit (German)
                  #     (attested in IANA comments though not their code)
 MET      3600    # Middle Europe Time
                  #     (MET)
 METDST   7200 D  # Middle Europe Summer Time (not in IANA database)
-MEZ      3600    # Mitteleuropäische Zeit (German)
+MEZ      3600    # Mitteleuropaeische Zeit (German)
                  #     (attested in IANA comments though not their code)
 MSD     14400 D  # Moscow Daylight Time (obsolete)
 MSK     Europe/Moscow  # Moscow Time