diff --git a/src/surfaceFilmModels/submodels/kinematic/injectionModel/injectionModel/injectionModel.H b/src/surfaceFilmModels/submodels/kinematic/injectionModel/injectionModel/injectionModel.H
index a05d028ffde73a7686242935cb5b689b723f69ed..539184c74580e7a6559a5620e2c51a1b503dea0a 100644
--- a/src/surfaceFilmModels/submodels/kinematic/injectionModel/injectionModel/injectionModel.H
+++ b/src/surfaceFilmModels/submodels/kinematic/injectionModel/injectionModel/injectionModel.H
@@ -25,6 +25,15 @@ Class
     Foam::injectionModel
 
 Description
+    Injection model class for use with surface film modelling
+
+    Sets the newly injected fluid properties by manipulating two arrays:
+
+      - massToInject
+      - diameterToInject
+
+    This mass is later subtracted from the film
+
 
 SourceFiles
     injectionModelI.H
diff --git a/src/surfaceFilmModels/surfaceFilmModel/surfaceFilmModel/surfaceFilmModel.H b/src/surfaceFilmModels/surfaceFilmModel/surfaceFilmModel/surfaceFilmModel.H
index 9e9030fe2bb30cd1bb20a129ae96f17bb0e13c46..c8c01ed6a7274a3d0e0552c56188f7a046ec0a07 100644
--- a/src/surfaceFilmModels/surfaceFilmModel/surfaceFilmModel/surfaceFilmModel.H
+++ b/src/surfaceFilmModels/surfaceFilmModel/surfaceFilmModel/surfaceFilmModel.H
@@ -25,6 +25,7 @@ Class
     Foam::surfaceFilmModel
 
 Description
+    Top level class that provides surface film modelling functionality
 
 SourceFiles
     surfaceFilmModelI.H