diff --git a/Docs/README.submodels b/Docs/README.submodels
index 9f26ca531..59755deaf 100644
--- a/Docs/README.submodels
+++ b/Docs/README.submodels
@@ -23,12 +23,12 @@
       <count>        Number of submodels available for multiple release.
                      -1 defines an unlimited number.
       <slaved>       Not used yet.
-      <x-offset>     Submodel's initial fore/aft position relative to user
-                     aircraft.   Fore is positive.
-      <y-offset>     Submodel's initial left/right position relative to user
-                     aircraft.   Right is positive.
-      <z-offset>     Submodel's initial up/down position relative to user
-                     aircraft.   Up is positive.
+      <x-offset>     Submodel's initial fore/aft position (in feet), relative to user
+                     aircraft.  Fore is positive.
+      <y-offset>     Submodel's initial left/right position (in feet), relative to user
+                     aircraft.  Right is positive.
+      <z-offset>     Submodel's initial up/down position (in feet), relative to user
+                     aircraft.  Up is positive.
       <yaw-offset>   Submodel's initial azimuth, in degrees, relative to user
                      aircraft'snose.   Right is positive.
       <pitch-offset> Submodel's initial elevation, in degrees, relative to user