diff --git a/README.md b/README.md
index 8a43f486..4b288d85 100644
--- a/README.md
+++ b/README.md
@@ -160,4 +160,17 @@ size: 1
 type: Strictly_negative_float
 doc: Calculated HF energy
 interface: ezfio
-```
\ No newline at end of file
+```
+
+#FAQ
+
+### Error: ezfio_* is already defined.
+
+#### Why ?
+
+You have two or more ezfio configuration file for the same variable. Check in `$QP_ROOT/install/config/`
+
+#### Fix
+
+    - rm $QP_ROOT/install/EZFIO/config/*
+    - ninja 
\ No newline at end of file
diff --git a/plugins/Hartree_Fock/.gitignore b/plugins/Hartree_Fock/.gitignore
index dbafb30b..189438ef 100644
--- a/plugins/Hartree_Fock/.gitignore
+++ b/plugins/Hartree_Fock/.gitignore
@@ -21,4 +21,5 @@ MOGuess
 Nuclei
 Utils
 Huckel_guess
+test
 SCF
\ No newline at end of file