diff --git a/R/build_log_entry.R b/R/build_log_entry.R
index 0eaa591..3a21ca9 100644
--- a/R/build_log_entry.R
+++ b/R/build_log_entry.R
@@ -24,6 +24,7 @@
 #' @param timestamp       logging timestamp as \code{\link{POSIXct}} (normally by calling \code{\link{Sys.time}})
 #' @param severity        severity level of the log entry ((ERROR, WARN, INFO etc.)
 #' @param msg.text        Logging message (e. g. error message)
+#' @param pid             a process id or other text identifier that will be added to msg.text
 #' @param call.stack      a call stack created by \code{\link{sys.calls}}
 #' @param dump.file.name  name of the created dump file (leave empty if the \code{\link{tryCatchLog}}
 #'                        argument \code{write.error.dump.file} is \code{FALSE}
@@ -47,7 +48,7 @@
 #'               \code{\link{build.log.output}}
 #'
 #' @note         THIS IS A PACKAGE INTERNAL FUNCTION AND THEREFORE NOT EXPORTED.
-build.log.entry <- function(timestamp, severity, msg.text, call.stack, dump.file.name, omit.call.stack.items = 0) {
+build.log.entry <- function(timestamp, severity, msg.text, pid, call.stack, dump.file.name, omit.call.stack.items = 0) {
 
   stopifnot(inherits(timestamp, "POSIXct"))
 
@@ -56,6 +57,7 @@ build.log.entry <- function(timestamp, severity, msg.text, call.stack, dump.file
   log.entry <- data.frame(timestamp           = timestamp,
                           severity            = severity,
                           msg.text            = msg.text,
+                          pid                 = ifelse(is.null(pid), NA, pid),
                           compact.stack.trace = get.pretty.call.stack(call.stack, omit.call.stack.items, compact = TRUE),
                           full.stack.trace    = get.pretty.call.stack(call.stack, omit.call.stack.items),
                           dump.file.name      = dump.file.name,
diff --git a/R/build_log_output.R b/R/build_log_output.R
index 39c5eba..aadafc8 100644
--- a/R/build_log_output.R
+++ b/R/build_log_output.R
@@ -82,6 +82,8 @@ build.log.output <- function(log.results,
                   if (include.severity)
                     paste0("[", log.results$severity[i], "] "),
                   log.results$msg.text[i],
+                  if (!is.na(log.results$pid[i]))
+                    paste0(" ", log.results$pid[i]), # No condition required, won't show if NULL
                   "\n\n",
                   if (nchar(log.results$dump.file.name[i]) > 0)
                     paste0("Created dump file: ", log.results$dump.file.name[i], "\n\n"),
diff --git a/R/tryCatchLog.R b/R/tryCatchLog.R
index 9a28c62..c892b3a 100644
--- a/R/tryCatchLog.R
+++ b/R/tryCatchLog.R
@@ -32,6 +32,7 @@
 #'                              \code{error}, \code{warning}, \code{message} and \code{interrupt}.
 #'                              All condition handlers are passed to \code{\link{tryCatch}} as is
 #'                              (no filtering, wrapping or changing of semantics).
+#' @param pid                   a process id or other text identifier that will be added to msg.text
 #' @param finally               expression to be evaluated at the end
 #' @param write.error.dump.file \code{TRUE}: Saves a dump of the workspace and the call stack named
 #'                              \code{dump_<YYYYMMDD>_at_<HHMMSS.sss>_PID_<process id>.rda}.
@@ -146,6 +147,7 @@
 tryCatchLog <- function(expr,
                         # error = function(e) {if (!is.null(getOption("error", stop))) eval(getOption("error", stop)) }, # getOption("error", default = stop),
                         ...,
+                        pid = NULL,
                         finally = NULL,
                         write.error.dump.file      = getOption("tryCatchLog.write.error.dump.file", FALSE),
                         write.error.dump.folder    = getOption("tryCatchLog.write.error.dump.folder", "."),
@@ -197,7 +199,7 @@ tryCatchLog <- function(expr,
 
 
 
-    log.entry <- build.log.entry(timestamp, severity, log.message, call.stack, dump.file.name, omit.call.stack.items = 1)
+    log.entry <- build.log.entry(timestamp, severity, log.message, pid, call.stack, dump.file.name, omit.call.stack.items = 1)
 
     if (!is.duplicated.log.entry(log.entry)) {