diff --git a/src/formats/fitacf.rs b/src/formats/fitacf.rs
index 9a398e5..1fe5dbd 100644
--- a/src/formats/fitacf.rs
+++ b/src/formats/fitacf.rs
@@ -56,9 +56,10 @@ static SCALAR_FIELDS: [(&str, Type); 49] = [
     ("noise.vel", Type::Float),
 ];
 
-static SCALAR_FIELDS_OPT: [(&str, Type); 4] = [
+static SCALAR_FIELDS_OPT: [(&str, Type); 5] = [
     ("mplgexs", Type::Short),
     ("ifmode", Type::Short),
+    ("widetx", Type::Short),
     ("algorithm", Type::String),
     ("tdiff", Type::Float),
 ];
diff --git a/src/formats/iqdat.rs b/src/formats/iqdat.rs
index 24cbf15..4ee25ca 100644
--- a/src/formats/iqdat.rs
+++ b/src/formats/iqdat.rs
@@ -57,7 +57,11 @@ static SCALAR_FIELDS: [(&str, Type); 50] = [
     ("skpnum", Type::Int),
 ];
 
-static SCALAR_FIELDS_OPT: [(&str, Type); 2] = [("mplgexs", Type::Short), ("ifmode", Type::Short)];
+static SCALAR_FIELDS_OPT: [(&str, Type); 3] = [
+    ("mplgexs", Type::Short),
+    ("ifmode", Type::Short),
+    ("widetx", Type::Short),
+];
 
 static VECTOR_FIELDS: [(&str, Type); 9] = [
     ("ptab", Type::Short),
diff --git a/src/formats/rawacf.rs b/src/formats/rawacf.rs
index 713b54d..deb68b1 100644
--- a/src/formats/rawacf.rs
+++ b/src/formats/rawacf.rs
@@ -54,7 +54,11 @@ static SCALAR_FIELDS: [(&str, Type); 47] = [
     ("thr", Type::Float),
 ];
 
-static SCALAR_FIELDS_OPT: [(&str, Type); 2] = [("mplgexs", Type::Short), ("ifmode", Type::Short)];
+static SCALAR_FIELDS_OPT: [(&str, Type); 3] = [
+    ("mplgexs", Type::Short),
+    ("ifmode", Type::Short),
+    ("widetx", Type::Short),
+];
 
 static VECTOR_FIELDS: [(&str, Type); 5] = [
     ("ptab", Type::Short),
diff --git a/src/formats/snd.rs b/src/formats/snd.rs
index d2d7a7d..226e43d 100644
--- a/src/formats/snd.rs
+++ b/src/formats/snd.rs
@@ -44,7 +44,7 @@ static SCALAR_FIELDS: [(&str, Type); 37] = [
     ("snd.revision.minor", Type::Short),
 ];
 
-static SCALAR_FIELDS_OPT: [(&str, Type); 0] = [];
+static SCALAR_FIELDS_OPT: [(&str, Type); 1] = [("widetx", Type::Short)];
 
 static VECTOR_FIELDS: [(&str, Type); 0] = [];