diff --git a/DESCRIPTION b/DESCRIPTION
index 03632ab6fa8d50290cb4bf94e388afea856d836e..0eeed09ab4db77b57e4f212acf005c37f67a239c 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,8 +1,8 @@
 Package: airGR
 Type: Package
 Title: Suite of GR Hydrological Models for Precipitation-Runoff Modelling
-Version: 1.2.1.1
-Date: 2019-01-30
+Version: 1.2.2.0
+Date: 2019-02-15
 Authors@R: c(
   person("Laurent", "Coron", role = c("aut", "trl"), comment = c(ORCID = "0000-0002-1503-6204")),
   person("Charles", "Perrin", role = c("aut", "ths"), comment = c(ORCID = "0000-0001-8552-1881")),
diff --git a/NEWS.rmd b/NEWS.rmd
index 448d57e4ccf4b72f2525d72c7d3b22c7374a5c0c..2c09db937e0bfba621f5019ccebd71d03f0f9533 100644
--- a/NEWS.rmd
+++ b/NEWS.rmd
@@ -13,7 +13,7 @@ output:
 
 
 
-### 1.2.1.1 Release Notes (2019-01-30) 
+### 1.2.2.0 Release Notes (2019-01-30) 
 
 
 
diff --git a/R/TransfoParam_CemaNeigeHyst.R b/R/TransfoParam_CemaNeigeHyst.R
new file mode 100644
index 0000000000000000000000000000000000000000..09a889342026cd58205ac59a58375ce98e2366db
--- /dev/null
+++ b/R/TransfoParam_CemaNeigeHyst.R
@@ -0,0 +1,46 @@
+TransfoParam_CemaNeigeHyst <- function(ParamIn, Direction) {
+  
+  
+  NParam <- 4L
+  
+  
+  ## check_arguments
+  Bool <- is.vector(ParamIn)
+  if (Bool) {
+    ParamIn <- matrix(ParamIn, nrow = 1)
+    warning("'ParamIn' automatically convert to 'matrix'")
+  }  
+  if (!inherits(ParamIn, "matrix")) {
+    stop("'ParamIn' must be of class 'matrix'")
+  }
+  if (!inherits(Direction, "character") | length(Direction) != 1 | any(!Direction %in% c("RT", "TR"))) {
+    stop("'Direction' must be a character vector of length 1 equal to 'RT' or 'TR'")
+  }
+  if (ncol(ParamIn) != NParam) {
+    stop(sprintf( "the CemaNeige module with hysteresis requires %i parameters", NParam))
+  }
+  
+  
+  if (Direction == "TR") {
+    ParamOut <-  ParamIn
+    ParamOut[, 1] <- (ParamIn[, 1] + 9.99) / 19.98 ### CemaNeige X1 (weighting coefficient for snow pack thermal state)
+    ParamOut[, 2] <- exp(ParamIn[, 2]) / 200       ### CemaNeige X2 (degree-day melt coefficient)
+    ParamOut[, 3] <- (ParamIn[, 3] * 5) + 50       ### Hyst Gaccum
+    ParamOut[, 4] <- (ParamIn[, 4] / 19.98) + 0.5  ### Hyst CV
+  }
+  if (Direction == "RT") {
+    ParamOut <-  ParamIn
+    ParamOut[, 1] <-  ParamIn[, 1] * 19.98 - 9.99  ### CemaNeige X1 (weighting coefficient for snow pack thermal state)
+    ParamOut[, 2] <- log(ParamIn[, 2] * 200)       ### CemaNeige X2 (degree-day melt coefficient)
+    ParamOut[, 3] <- (ParamIn[, 3] - 50) / 5       ### Hyst Gaccum
+    ParamOut[, 4] <- (ParamIn[, 4] - 0.5) * 19.98  ### Hyst CV
+  }
+  
+  if (Bool) {
+    ParamOut <- as.vector(ParamOut)
+  }
+  
+  return(ParamOut)
+  
+}
+