diff --git a/.Rbuildignore b/.Rbuildignore
index 0ecb4c3..61952ed 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -22,3 +22,4 @@ cran-comments.md
 ^NEWS\.md$
 # Release announcement
 release_files
+^CRAN-RELEASE$
diff --git a/CRAN-RELEASE b/CRAN-RELEASE
new file mode 100644
index 0000000..d3f6dae
--- /dev/null
+++ b/CRAN-RELEASE
@@ -0,0 +1,2 @@
+This package was submitted to CRAN on 2020-05-21.
+Once it is accepted, delete this file and tag the release (commit eb25a9ef5d).
diff --git a/DESCRIPTION b/DESCRIPTION
index 788cc6b..4f6ccd5 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -24,7 +24,6 @@ Imports:
     methods,
     progress,
     rgdal,
-    sf,
     sp,
     raster,
     SSN
diff --git a/R/calc_attributes_edges.R b/R/calc_attributes_edges.R
index a96a6c2..645b2fc 100644
--- a/R/calc_attributes_edges.R
+++ b/R/calc_attributes_edges.R
@@ -736,7 +736,7 @@ calc_catchment_attributes_vect_rec <- function(dt, id, stat_vect, attr_name_vect
 #' 
 #' @note This function is sensitive to MASKs, i.e. if a MASK is present,
 #'  only the part or the raster is processed within the MASK; 
-#'  \href{https://grass.osgeo.org/grass75/manuals/r.mask.html}{r.mask}.
+#'  \href{https://grass.osgeo.org/grass78/manuals/r.mask.html}{r.mask}.
 
 get_n_val_raster <- function(raster_name){
   return(length(get_all_raster_values(raster_name)))
@@ -754,7 +754,7 @@ get_n_val_raster <- function(raster_name){
 #' 
 #' @note This function is sensitive to MASKs, i.e. if a MASK is present,
 #'  only the part or the raster is processed within the MASK; 
-#'  \href{https://grass.osgeo.org/grass75/manuals/r.mask.html}{r.mask}.
+#'  \href{https://grass.osgeo.org/grass78/manuals/r.mask.html}{r.mask}.
 
 get_all_raster_values <- function(raster_name){
   r <- execGRASS("r.stats", flags = c("l","n"),
diff --git a/man/get_all_raster_values.Rd b/man/get_all_raster_values.Rd
index 7fcb0bf..bacdf8c 100644
--- a/man/get_all_raster_values.Rd
+++ b/man/get_all_raster_values.Rd
@@ -19,6 +19,6 @@ Returns the number of different values in the input raster.
 \note{
 This function is sensitive to MASKs, i.e. if a MASK is present,
  only the part or the raster is processed within the MASK; 
- \href{https://grass.osgeo.org/grass75/manuals/r.mask.html}{r.mask}.
+ \href{https://grass.osgeo.org/grass78/manuals/r.mask.html}{r.mask}.
 }
 \keyword{internal}
diff --git a/man/get_n_val_raster.Rd b/man/get_n_val_raster.Rd
index 3361c91..301ba4d 100644
--- a/man/get_n_val_raster.Rd
+++ b/man/get_n_val_raster.Rd
@@ -19,6 +19,6 @@ Returns the number of different values in the input raster.
 \note{
 This function is sensitive to MASKs, i.e. if a MASK is present,
  only the part or the raster is processed within the MASK; 
- \href{https://grass.osgeo.org/grass75/manuals/r.mask.html}{r.mask}.
+ \href{https://grass.osgeo.org/grass78/manuals/r.mask.html}{r.mask}.
 }
 \keyword{internal}