diff --git a/R/methSeg.R b/R/methSeg.R
index 62684c32..898a43fd 100644
--- a/R/methSeg.R
+++ b/R/methSeg.R
@@ -115,17 +115,17 @@ methSeg<-function(obj, diagnostic.plot=TRUE, join.neighbours=FALSE,
   # destrand
   strand(obj) <- "*"
   
-  ## check wether obj contains at least one metacol 
+  ## check whether obj contains at least one metacol 
   if(ncol(elementMetadata(obj))<1)
     stop("GRanges does not have any meta column.")
   
-  ## check wether obj contains is sorted by position
+  ## check whether obj contains is sorted by position
   if(is.unsorted(obj,ignore.strand=TRUE)) {
     obj <- sort(obj,ignore.strand=TRUE)
     message("Object not sorted by position, sorting now.")
   }
   
-  ## check wether obj contains at least two ranges else stop
+  ## check whether obj contains at least two ranges else stop
   if(length(obj)<=1)
     stop("segmentation requires at least two ranges.")
   
diff --git a/R/methylDBFunctions.R b/R/methylDBFunctions.R
index f59f1e29..97a61c57 100644
--- a/R/methylDBFunctions.R
+++ b/R/methylDBFunctions.R
@@ -1,10 +1,11 @@
 # Helper Functions ---------------------------------------------------
 
+
 #' @noRd
 ## function checks wether a tabix file already exists and 
 ## appends number if file already exists  
 .checkTabixFileExists <- function(tabixfile) {
-  message("\nchecking wether tabix file already exists:")
+  message("\nchecking whether tabix file already exists:")
   tabixfile <- paste0(tabixfile,".bgz")
   message(tabixfile)
   if(file.exists(tabixfile) ) {
diff --git a/R/tabix.functions.R b/R/tabix.functions.R
index a8053bfc..9fd47732 100644
--- a/R/tabix.functions.R
+++ b/R/tabix.functions.R
@@ -273,7 +273,7 @@ obj2tabix <- function(obj,filename,rm.txt=TRUE){
            append = TRUE)
 }
 
-#' function to check wether tabix header exists 
+#' function to check whether tabix header exists 
 #' and exit with message instead of error
 #'
 #' @param tbxFile tabix file
diff --git a/src/methCall.cpp b/src/methCall.cpp
index 87ac8df5..e05ce889 100644
--- a/src/methCall.cpp
+++ b/src/methCall.cpp
@@ -953,7 +953,7 @@ int process_bam ( std::string &input,
     else if( (xr_tag == "ZGA") && (xg_tag == "ZGA") ) {strand='-';} // complementary to original bottom strand, bismark says + strand to this
     
     
-    // check wether read is proper paired (both mapped)
+    // check whether read is proper paired (both mapped)
     int proper_paired = (int) ((b)->core.flag&BAM_FPROPER_PAIR);
     
     // if is proper pair and no_overlap is set