diff --git a/sync-history.sh b/sync-history.sh
index 6ea52a1..3b1ad62 100755
--- a/sync-history.sh
+++ b/sync-history.sh
@@ -1,3 +1,7 @@
+# Forked from https://gist.github.com/jan-warchol/89f5a748f7e8a2c9e91c9bc1b358d3ec with those changes :
+# - `\cat` instead of `cat`
+# - `export HISTFILE....` to avoid using default dir.
+# 
 # Synchronize history between bash sessions
 #
 # Make history from other terminals available to the current one. However,