diff --git a/NAMESPACE b/NAMESPACE
index cf48cce..400cf82 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -114,7 +114,7 @@ export(sEddyProc_sTKFluxPartition)
 export(sEddyProc_sTKFluxPartitionUStarScens)
 export(sEddyProc_update_ustarthreshold_columns)
 export(sEddyProc_useAnnualUStarThresholds)
-export(sEddyProc_useSeaonsalUStarThresholds)
+export(sEddyProc_useSeasonalUStarThresholds)
 export(usControlUstarEst)
 export(usControlUstarSubsetting)
 export(usCreateSeasonFactorMonth)
diff --git a/R/aEddy.R b/R/aEddy.R
index 25a3abc..92858ed 100644
--- a/R/aEddy.R
+++ b/R/aEddy.R
@@ -286,7 +286,7 @@ sEddyProc_sSetUstarScenarios <- function(
 sEddyProc$methods(sSetUstarScenarios = sEddyProc_sSetUstarScenarios)
 
 #' @export
-sEddyProc_useSeaonsalUStarThresholds <- function(
+sEddyProc_useSeasonalUStarThresholds <- function(
   ### use seasonal estimates of uStar thresholds
 ) {
   ##seealso<< \code{\link{sEddyProc_sSetUstarScenarios}},
@@ -295,14 +295,16 @@ sEddyProc_useSeaonsalUStarThresholds <- function(
   uStarMap <- usGetSeasonalSeasonUStarMap(uStarThAgg)
   .self$sSetUstarScenarios(uStarMap)
 }
-sEddyProc$methods(useSeaonsalUStarThresholds = sEddyProc_useSeaonsalUStarThresholds)
+sEddyProc$methods(useSeasonalUStarThresholds = sEddyProc_useSeasonalUStarThresholds)
+# backward compatibiity to former typo
+sEddyProc$methods(useSeaonsalUStarThresholds = sEddyProc_useSeasonalUStarThresholds)
 
 #' @export
 sEddyProc_useAnnualUStarThresholds <- function(
   ### use seasonal estimates of uStar thresholds
 ) {
   ##seealso<< \code{\link{sEddyProc_sSetUstarScenarios}},
-  ## \code{\link{sEddyProc_useSeaonsalUStarThresholds}}
+  ## \code{\link{sEddyProc_useSeasonalUStarThresholds}}
   uStarThAgg <- .self$sGetEstimatedUstarThresholdDistribution()
   uStarMap <- usGetAnnualSeasonUStarMap(uStarThAgg)
   .self$sSetUstarScenarios(uStarMap)
diff --git a/man/sEddyProc_useAnnualUStarThresholds.Rd b/man/sEddyProc_useAnnualUStarThresholds.Rd
index b4a38a3..572628e 100644
--- a/man/sEddyProc_useAnnualUStarThresholds.Rd
+++ b/man/sEddyProc_useAnnualUStarThresholds.Rd
@@ -11,5 +11,5 @@
 
 
 \seealso{\code{\link{sEddyProc_sSetUstarScenarios}},
-\code{\link{sEddyProc_useSeaonsalUStarThresholds}}}
+\code{\link{sEddyProc_useSeasonalUStarThresholds}}}
 
diff --git a/man/sEddyProc_useSeaonsalUStarThresholds.Rd b/man/sEddyProc_useSeasonalUStarThresholds.Rd
similarity index 76%
rename from man/sEddyProc_useSeaonsalUStarThresholds.Rd
rename to man/sEddyProc_useSeasonalUStarThresholds.Rd
index a1e71ee..c430557 100644
--- a/man/sEddyProc_useSeaonsalUStarThresholds.Rd
+++ b/man/sEddyProc_useSeasonalUStarThresholds.Rd
@@ -1,8 +1,8 @@
-\name{sEddyProc_useSeaonsalUStarThresholds}
-\alias{sEddyProc_useSeaonsalUStarThresholds}
-\title{sEddyProc useSeaonsalUStarThresholds}
+\name{sEddyProc_useSeasonalUStarThresholds}
+\alias{sEddyProc_useSeasonalUStarThresholds}
+\title{sEddyProc useSeasonalUStarThresholds}
 \description{use seasonal estimates of uStar thresholds}
-\usage{sEddyProc_useSeaonsalUStarThresholds()}
+\usage{sEddyProc_useSeasonalUStarThresholds()}
 
 
 
diff --git a/vignettes/DEGebExample.Rmd b/vignettes/DEGebExample.Rmd
index 2fde8b8..f7a4f81 100644
--- a/vignettes/DEGebExample.Rmd
+++ b/vignettes/DEGebExample.Rmd
@@ -103,7 +103,7 @@ abline( v = seasonStartsDate$DateTime)
 The user-specific seasoning is provided to the gap-filling by the argument `seasonFactor`. 
 ```{r DEGeb_estUStar1b, cache = TRUE}
 (uStarTh <- EProc$sEstUstarThold(seasonFactor = seasonFactor))
-#EProc$useSeaonsalUStarThresholds()
+#EProc$useSeasonalUStarThresholds()
 # estimation can be inspected by plotting the saturation of NEE with UStar 
 # for the temperatures of one season
 #EProc$sPlotNEEVersusUStarForSeason( levels(uStarTh$season)[2] )
@@ -116,11 +116,11 @@ the mean across the years.
 By default the gap-filling uses annually aggregated estimates of uStar-Threshold.
 This usually works for sites with continuous vegetation cover.
 For the crop-site of this example, we will use a different threshold for each of 
-the defined seasons, by calling `sEddyProc_useSeaonsalUStarThresholds` 
+the defined seasons, by calling `sEddyProc_useSeasonalUStarThresholds` 
 before gapfilling.
 
 ```{r DEGeb_estUStar1c}
-EProc$useSeaonsalUStarThresholds()
+EProc$useSeasonalUStarThresholds()
 EProc$sGetUstarScenarios()
 ```	
 
@@ -154,7 +154,7 @@ EProc$sEstimateUstarScenarios(
 #  EProc$sGetEstimatedUstarThresholdDistribution()
 #))
 #EProc$sSetUstarScenarios(uStarScens)
-EProc$useSeaonsalUStarThresholds()
+EProc$useSeasonalUStarThresholds()
 EProc$sGetUstarScenarios()
 ```	
 
@@ -205,7 +205,7 @@ resUStar <- EProc$sEstUstarThold(
 					, seasonFactor = seasonFactor
 			)
 #(uStarThCP <- usGetSeasonalSeasonUStarMap(resUStar))
-EProc$useSeaonsalUStarThresholds()
+EProc$useSeasonalUStarThresholds()
 EProc$sGetUstarScenarios()
 ```
 
diff --git a/vignettes/DEGebExample.md b/vignettes/DEGebExample.md
index aa37a78..c3a970d 100644
--- a/vignettes/DEGebExample.md
+++ b/vignettes/DEGebExample.md
@@ -93,7 +93,7 @@ argument `seasonFactor`.
     ## 12          season       2006 2006120 0.06966667
     ## 13          season       2006 2006305 0.25094444
 
-    #EProc$useSeaonsalUStarThresholds()
+    #EProc$useSeasonalUStarThresholds()
     # estimation can be inspected by plotting the saturation of NEE with UStar 
     # for the temperatures of one season
     #EProc$sPlotNEEVersusUStarForSeason( levels(uStarTh$season)[2] )
@@ -106,9 +106,9 @@ By default the gap-filling uses annually aggregated estimates of
 uStar-Threshold. This usually works for sites with continuous vegetation
 cover. For the crop-site of this example, we will use a different
 threshold for each of the defined seasons, by calling
-`sEddyProc_useSeaonsalUStarThresholds` before gapfilling.
+`sEddyProc_useSeasonalUStarThresholds` before gapfilling.
 
-    EProc$useSeaonsalUStarThresholds()
+    EProc$useSeasonalUStarThresholds()
     EProc$sGetUstarScenarios()
 
     ##     season      uStar
@@ -148,7 +148,7 @@ uStar Threshold.
     #  EProc$sGetEstimatedUstarThresholdDistribution()
     #))
     #EProc$sSetUstarScenarios(uStarScens)
-    EProc$useSeaonsalUStarThresholds()
+    EProc$useSeasonalUStarThresholds()
     EProc$sGetUstarScenarios()
 
     ##     season      uStar        U10        U90
@@ -206,7 +206,7 @@ as Gap.
                         , seasonFactor = seasonFactor
                 )
     #(uStarThCP <- usGetSeasonalSeasonUStarMap(resUStar))
-    EProc$useSeaonsalUStarThresholds()
+    EProc$useSeasonalUStarThresholds()
     EProc$sGetUstarScenarios()
 
     ##     season     uStar
diff --git a/vignettes/uStarCases.Rmd b/vignettes/uStarCases.Rmd
index 6e91642..2746064 100644
--- a/vignettes/uStarCases.Rmd
+++ b/vignettes/uStarCases.Rmd
@@ -152,12 +152,12 @@ In conjunction with method `usGetSeasonalSeasonUStarMap` and
 `sEddyProc_sSetUstarScenarios` this can be used
 to set seasonally different u* threshold. 
 However, this common case supported by method 
-`sEddyProc_useSeaonsalUStarThresholds`. 
+`sEddyProc_useSeasonalUStarThresholds`. 
 
 ```{r uStarScenSetSeasonal}
 #EProc$sSetUstarScenarios(
 #  usGetSeasonalSeasonUStarMap(uStarThAgg)[,-2])
-EProc$useSeaonsalUStarThresholds()
+EProc$useSeasonalUStarThresholds()
 # inspect the changed thresholds to be used
 EProc$sGetUstarScenarios()
 ```
diff --git a/vignettes/uStarCases.md b/vignettes/uStarCases.md
index a29e793..a6c07fd 100644
--- a/vignettes/uStarCases.md
+++ b/vignettes/uStarCases.md
@@ -149,11 +149,11 @@ estimates for different aggregation levels, use method
 In conjunction with method `usGetSeasonalSeasonUStarMap` and
 `sEddyProc_sSetUstarScenarios` this can be used to set seasonally
 different u\* threshold. However, this common case supported by method
-`sEddyProc_useSeaonsalUStarThresholds`.
+`sEddyProc_useSeasonalUStarThresholds`.
 
     #EProc$sSetUstarScenarios(
     #  usGetSeasonalSeasonUStarMap(uStarThAgg)[,-2])
-    EProc$useSeaonsalUStarThresholds()
+    EProc$useSeasonalUStarThresholds()
     # inspect the changed thresholds to be used
     EProc$sGetUstarScenarios()