diff --git a/.githooks/post-checkout b/.githooks/post-checkout
index d61859c..52a8e1f 100755
--- a/.githooks/post-checkout
+++ b/.githooks/post-checkout
@@ -1,14 +1,31 @@
 #!/bin/bash
 
-repoRoot=$(git rev-parse --show-toplevel)
-listFilesToSubstitute=$(find -name *.gitsubstitute)
-
 staticPathSubstitution="\$\$\${GITSUBSTITUTE_REPO_ROOT}"
+oneOrMoreSubstitutedFileExists="false"
 
-for entryFileToSubstitute in $listFilesToSubstitute; do
-    fullPath="${repoRoot}/${entryFileToSubstitute}"
-    fullPathSubstitute="${repoRoot}/${entryFileToSubstitute%.gitsubstitute}"
+# if checkout is a branch checkout
+if [ $3 == "1" ]; then
+    echo "Looking for files to substitute..."
+    
+    repoRoot=$(git rev-parse --show-toplevel)
+    listFilesToSubstitute=$(find -name *.gitsubstitute)
+    
+    for fileToSubstitute in $listFilesToSubstitute; do
+        if ! [ -f ${fileToSubstitute%.gitsubstitute} ]; then
+            echo "create file: ${fileToSubstitute%.gitsubstitute}"
+            
+            fullPath="${repoRoot}/${fileToSubstitute}"
+            fullPathSubstitute="${repoRoot}/${fileToSubstitute%.gitsubstitute}"
+            
+            fileContent=$(<$fullPath)
+            echo "${fileContent//${staticPathSubstitution}/${repoRoot}}" > "${fullPathSubstitute}"
+        else
+            oneOrMoreSubstitutedFileExists="true"
+        fi
+    done
     
-    fileContent=$(<$fullPath)
-    echo "${fileContent//${staticPathSubstitution}/${repoRoot}}" > "${fullPathSubstitute}"
-done
+    if [ $oneOrMoreSubstitutedFileExists == "true" ]; then
+        echo "One or more substituted file exists."
+        echo "If you want to clean the repo and recreate all projects run './clean_and_recreate_all'"
+    fi
+fi