diff --git a/NAMESPACE b/NAMESPACE
index bd5954d..cb41b25 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -62,6 +62,8 @@ importFrom(sf,st_crs)
 importFrom(shadowtext,geom_shadowtext)
 importFrom(sp,plot)
 importFrom(sp,proj4string)
+importFrom(spdep,nb2mat)
+importFrom(spdep,poly2nb)
 importFrom(stats,aggregate)
 importFrom(stats,as.formula)
 importFrom(stats,dgamma)
diff --git a/R/getAmat.R b/R/getAmat.R
index 993fe8c..279cdf5 100644
--- a/R/getAmat.R
+++ b/R/getAmat.R
@@ -4,6 +4,7 @@
 #' @param names  character vector of region ids to be added to the neighbours list
 #' 
 #' @return Spatial djacency matrix.
+#' @importFrom spdep poly2nb nb2mat
 #' @author Zehang Richard Li 
 #' @examples
 #' \dontrun{