diff --git a/Lib/axisregistry/data/flair.textproto b/Lib/axisregistry/data/flair.textproto
index d95dac1b4..89a1a7ae7 100644
--- a/Lib/axisregistry/data/flair.textproto
+++ b/Lib/axisregistry/data/flair.textproto
@@ -12,6 +12,7 @@ fallback {
   name: "Flair"
   value: 100.0
 }
+fallback_only: false
 description: 
   "As the flair axis grows, the straight sans serif terminals develop"
   " a swelling, and joints become more idiosyncratic. Originally referring"
diff --git a/Lib/axisregistry/data/volume.textproto b/Lib/axisregistry/data/volume.textproto
index 119e8d353..aa1ef4c69 100644
--- a/Lib/axisregistry/data/volume.textproto
+++ b/Lib/axisregistry/data/volume.textproto
@@ -12,6 +12,7 @@ fallback {
   name: "Loud"
   value: 100.0
 }
+fallback_only: false
 description:
   "Transforms serifs from glyphic to wedge shapes,"
   " and adds a little more edge to other details."
diff --git a/Lib/axisregistry/data/x_opaque.textproto b/Lib/axisregistry/data/x_opaque.textproto
index 608b48cd0..4dfdaf79a 100644
--- a/Lib/axisregistry/data/x_opaque.textproto
+++ b/Lib/axisregistry/data/x_opaque.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 88
 }
+fallback_only: false
 description:
   "Assigns a 'black' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/x_transparent.textproto b/Lib/axisregistry/data/x_transparent.textproto
index 4ec7bfea0..d4be67d9c 100644
--- a/Lib/axisregistry/data/x_transparent.textproto
+++ b/Lib/axisregistry/data/x_transparent.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 400
 }
+fallback_only: false
 description:
   "Assigns a 'white'”' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/x_transparent_figures.textproto b/Lib/axisregistry/data/x_transparent_figures.textproto
index aac6944b3..9ae978509 100644
--- a/Lib/axisregistry/data/x_transparent_figures.textproto
+++ b/Lib/axisregistry/data/x_transparent_figures.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 400
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."
\ No newline at end of file
diff --git a/Lib/axisregistry/data/y_opaque.textproto b/Lib/axisregistry/data/y_opaque.textproto
index 2db4df667..91c108c59 100644
--- a/Lib/axisregistry/data/y_opaque.textproto
+++ b/Lib/axisregistry/data/y_opaque.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 116
 }
+fallback_only: false
 description:
   "Assigns a 'black' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/y_transparent_ascender.textproto b/Lib/axisregistry/data/y_transparent_ascender.textproto
index 3613b69a5..234e7b05d 100644
--- a/Lib/axisregistry/data/y_transparent_ascender.textproto
+++ b/Lib/axisregistry/data/y_transparent_ascender.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 750
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/y_transparent_descender.textproto b/Lib/axisregistry/data/y_transparent_descender.textproto
index 6c756e327..7ae8a7aa4 100644
--- a/Lib/axisregistry/data/y_transparent_descender.textproto
+++ b/Lib/axisregistry/data/y_transparent_descender.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: -250
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/y_transparent_figures.textproto b/Lib/axisregistry/data/y_transparent_figures.textproto
index 4461f57cf..798c96566 100644
--- a/Lib/axisregistry/data/y_transparent_figures.textproto
+++ b/Lib/axisregistry/data/y_transparent_figures.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 600
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."
\ No newline at end of file
diff --git a/Lib/axisregistry/data/y_transparent_lowercase.textproto b/Lib/axisregistry/data/y_transparent_lowercase.textproto
index 73614ecef..e8575ffc5 100644
--- a/Lib/axisregistry/data/y_transparent_lowercase.textproto
+++ b/Lib/axisregistry/data/y_transparent_lowercase.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 500
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."
diff --git a/Lib/axisregistry/data/y_transparent_uppercase.textproto b/Lib/axisregistry/data/y_transparent_uppercase.textproto
index bfb1fe6a9..bab698332 100644
--- a/Lib/axisregistry/data/y_transparent_uppercase.textproto
+++ b/Lib/axisregistry/data/y_transparent_uppercase.textproto
@@ -9,5 +9,6 @@ fallback {
   name: "Normal"
   value: 725
 }
+fallback_only: false
 description:
   "Assigns a 'white' per mille value to each instance of the design space."