diff --git a/change_log.md b/change_log.md
index 90d5b75..e888c15 100644
--- a/change_log.md
+++ b/change_log.md
@@ -1,3 +1,6 @@
+# V1.3 bug note
+- part of the code of fmeteo derives from deg2card which is currently buggy, consequently conversions on wind cardinal direction are sometimes incorrect or inaccurate. For further clarification look at the changelog of the programs
+
 # V1.3
 - now fmeteo convert wind degrees on cardinal notation (N..E.. N-NE..ecc) called "wind dir"
 - add deg2card tools script, look the readme on the tools folder for more info
diff --git a/tools/deg2card_README.md b/tools/deg2card_README.md
index 188e7b9..7642429 100644
--- a/tools/deg2card_README.md
+++ b/tools/deg2card_README.md
@@ -16,7 +16,7 @@ deg2card 360
 
 N
 
-## Dipend:
+## Depend:
 
 bc
 
diff --git a/tools/deg2card_changelog.md b/tools/deg2card_changelog.md
index e577da2..5963b61 100644
--- a/tools/deg2card_changelog.md
+++ b/tools/deg2card_changelog.md
@@ -1,3 +1,10 @@
-# V1.0
 
-- initial stable relase
\ No newline at end of file
+# V1.0 bug note
+
+- the wind direction range is not centered with the reference point, it results that the interval is moved 11.25 degrees clockwise and consequently the reference point is the first end of the interval and not the center.
+- my homemade algorithm in some conversions is bumped at 11.25 degrees in excess
+
+# V1.0 beta
+
+- initial  relase. 
+- homemade algorithm
\ No newline at end of file
diff --git a/tools/wind_dir_vs_deg.png b/tools/wind_dir_vs_deg.png
new file mode 100644
index 0000000..70a005e
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