diff --git a/DESCRIPTION b/DESCRIPTION
index b3a8264..3896951 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,10 +1,12 @@
 Package: sensorweb4R
 Title: Connect R to the Sensor Web Client API for downloading timeseries data.
 Version: 0.1
+Encoding: UTF-8
 Authors@R: c( person("Daniel", "Nuest", email = "d.nuest@52north.org", role =
+    c("aut")), person("Christian", "Autermann", email = "c.autermann@52north.org", role =
     c("aut", "cre")), person("52\u00b0North", email = "info@52north.org", role
     = c("cph"), comment = "This package is part of a managed codebase.") )
-Description: An R client for the 52\u00b0North Sensor Web Client API
+Description: An R client for the 52North Sensor Web Client API
 Depends:
     R (>= 3.1.1)
 License: Apache License (== 2.0) | file LICENSE
@@ -12,6 +14,7 @@ LazyData: true
 URL: https://github.com/52North/sensorweb4R
 BugReports: https://github.com/52North/sensorweb4R/issues
 Imports:
+    methods,
     futile.logger,
     httr,
     sp,
diff --git a/NAMESPACE b/NAMESPACE
index badc6d5..a8a9a9a 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -216,6 +216,7 @@ exportClasses(TVP)
 exportClasses(Timeseries)
 exportMethods(length)
 import(futile.logger)
+import(methods)
 import(sp)
 import(stats)
 import(xts)
diff --git a/R/distance-matrix.R b/R/distance-matrix.R
index e1529a2..5797754 100644
--- a/R/distance-matrix.R
+++ b/R/distance-matrix.R
@@ -194,7 +194,6 @@ setGeneric("distanceMatrix", function(x, ...)
 setMethod("distanceMatrix",
           signature(x = "SpatialPoints"),
           function(x, ...) {
-              require(geosphere)
               n <- length(x)
               dm <- matrix(0, ncol=n, nrow=n)
               for (i in 1:n) {
diff --git a/R/utils.R b/R/utils.R
index c15cd61..0f42306 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -31,7 +31,7 @@ license_header <- function(pkg = ".", header = "inst/license-header", add = FALS
         stop("devtools required to run license_header(). Please install.", call. = FALSE)
     }
 
-    files <- devtools::find_code(devtools:::as.package(pkg))
+    files <- devtools:::find_code(devtools::as.package(pkg))
     flog.debug("Checking license headers of %s files using '%s', adding if missing = %s", length(files), header, add)
 
     .result <- .addLicenseHeaderToFiles(files, header, add)
@@ -80,7 +80,7 @@ has_license_header <- function(pkg = ".", header = "inst/license-header") {
 
     files_missing_header <- list()
 
-    headerConn <- file(file.path(devtools:::as.package(".")$path, header), 'r+')
+    headerConn <- file(file.path(devtools::as.package(".")$path, header), 'r+')
     header_content <- readLines(headerConn)
     close(headerConn)
     flog.trace("Header: %s", paste(header_content, sep = "", collapse = ""))
diff --git a/R/zzz.R b/R/zzz.R
index 58c9a96..676db66 100644
--- a/R/zzz.R
+++ b/R/zzz.R
@@ -44,6 +44,7 @@
 #' @import futile.logger
 #' @keywords ts, spatial
 #' @concept sensorweb, timeseries
+#' @import methods
 NULL # documenting null to integrate this comment into a specific rd file via @name, see http://r-pkgs.had.co.nz/man.html#dry2
 
 # when you change .onLoad and .onAttach functions, don't forget to call load_all with reset=TRUE !
diff --git a/README.md b/README.md
index f4fe823..aff6b7c 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,13 @@ Futher user documentation is in the R help and the vignettes:
 
 ```r
 vignette(package = "sensorweb4R")
-vignette("<name of the vignette to open")
+vignette("<name of the vignette to open>")
+```
+
+When installed from source or GitHub, run the command [Rd2pdf](http://cran.r-project.org/doc/manuals/R-exts.html#index-R-CMD-Rd2pdf) in the parent directory of the package to create the reference manual, which describes all functions in the package:
+
+```
+R CMD Rd2pdf sensorweb4R
 ```
 
 ## Development