diff --git a/git/generae_overview_mermaid.sh b/git/generae_overview_mermaid.sh
index a2cbe25..9d5c0c9 100644
--- a/git/generae_overview_mermaid.sh
+++ b/git/generae_overview_mermaid.sh
@@ -22,13 +22,23 @@ echo "    branch $main_branch"
 echo "    checkout $main_branch"
 
 # Keep track of declared branches
-declare -A declared_branches
-declared_branches[$main_branch]=1
+declared_branches=("$main_branch")
+
+# Function to check if a branch is declared
+is_branch_declared() {
+    local branch=$1
+    for declared_branch in "${declared_branches[@]}"; do
+        if [[ "$declared_branch" == "$branch" ]]; then
+            return 0
+        fi
+    done
+    return 1
+}
 
 # Function to find the base branch
 find_base_branch() {
     local branch=$1
-    local base=$(git show-branch -a 2>/dev/null | grep '\*' | grep -v "$branch" | head -n1 | sed 's/.*\[\(.*\)\].*/\1/' | sed 's/[\^~].*//')
+    local base=$(git merge-base --fork-point "$branch" "$main_branch" || echo "$main_branch")
     if [[ -z "$base" ]]; then
         echo "$main_branch"
     else
@@ -39,9 +49,9 @@ find_base_branch() {
 # Function to declare a branch if not already declared
 declare_branch() {
     local branch=$1
-    if [[ -z "${declared_branches[$branch]}" ]]; then
+    if ! is_branch_declared "$branch"; then
         echo "    branch $(escape_for_mermaid "$branch")"
-        declared_branches[$branch]=1
+        declared_branches+=("$branch")
     fi
 }
 
@@ -50,15 +60,31 @@ for branch in $(git for-each-ref --sort=committerdate --format='%(refname:short)
     base_branch=$(find_base_branch "$branch")
 
     declare_branch "$branch"
-
     echo "    checkout $(escape_for_mermaid "$branch")"
     echo "    commit id: \"$(git log -1 --pretty=format:%s "$branch")\""
 
-    if [ "$branch" != "$main_branch" ]; then
-        echo "    checkout $(escape_for_mermaid "$base_branch")"
-        echo "    merge $(escape_for_mermaid "$branch")"
+    # Check which branches are merged into this branch
+    merged_branches=$(git branch --merged "$branch" | grep -v "\* $branch" | grep -v "$main_branch")
+    if [ -n "$merged_branches" ]; then
+        for merged_branch in $merged_branches; do
+            if [ "$merged_branch" != "$branch" ]; then
+                declare_branch "$merged_branch"
+                echo "    checkout $(escape_for_mermaid "$branch")"
+                echo "    merge $(escape_for_mermaid "$merged_branch")"
+            fi
+        done
     fi
 done
+
+# Check for branches not yet merged into master
+not_merged=$(git branch --no-merged "$main_branch")
+if [ -n "$not_merged" ]; then
+    echo "    commit id: \"Branches not yet merged into master:\""
+    for branch in $not_merged; do
+        echo "    commit id: \"$branch\""
+    done
+fi
+
 } > $output_file
 
 echo "Mermaid diagram saved to $output_file"