diff --git a/swad_changelog.h b/swad_changelog.h
index 6fa0404dd..b7547b4b7 100644
--- a/swad_changelog.h
+++ b/swad_changelog.h
@@ -120,6 +120,7 @@
 // TODO: In social refreshing via AJAX, an error occurs when session expirates
 // TODO: Messages in msg_content_deleted older than a certain time should be deleted to ensure the protection of personal data
 // TODO: FIX BUG: A teacher uploads a document in course documents zone, then he/she unregister from course, then he/she search for his/her documents, a document is shown in results but he/she can not view it
+// TODO: Add StackOverflow (and similar) to webs/networks
 
 // TODO: Modify WS function getUsers changing: userRole to indicate all users, and a new parameter filter (search string (name, @nickname, mail)) to restring number of users
 // TODO: Add a new WS function to count the nunmber of users to return in call to function getUsers
@@ -128,13 +129,14 @@
 /****************************** Public constants *****************************/
 /*****************************************************************************/
 
-#define Log_PLATFORM_VERSION	"SWAD 15.226 (2016-06-17)"
+#define Log_PLATFORM_VERSION	"SWAD 15.226.1 (2016-06-17)"
 #define CSS_FILE		"swad15.226.css"
 #define JS_FILE			"swad15.226.js"
 
 // Number of lines (includes comments but not blank lines) has been got with the following command:
 // nl swad*.c swad*.h css/swad*.css py/swad*.py js/swad*.js soap/swad*.h sql/swad*.sql | tail -1
 /*
+        Version 15.226.1: Jun 17, 2016	Changed layout of listing of similar users. (202887 lines)
         Version 15.226:   Jun 17, 2016	Fixed bug in photo zoom. (202870 lines)
         Version 15.225.21:Jun 17, 2016	Fixed bug in photo zoom, reported by Javier Fernández Baldomero. (202894 lines)
         Version 15.225.20:Jun 17, 2016	Show details of user's profile in similar users. (202893 lines)
diff --git a/swad_duplicate.c b/swad_duplicate.c
index 10fb96fb7..18f493f22 100644
--- a/swad_duplicate.c
+++ b/swad_duplicate.c
@@ -63,6 +63,8 @@ extern struct Globals Gbl;
 /***************************** Private prototypes ****************************/
 /*****************************************************************************/
 
+static bool Usr_CheckIfUsrIsDup (long UsrCod);
+
 /*****************************************************************************/
 /******************** Report a user as possible duplicate ********************/
 /*****************************************************************************/
@@ -236,6 +238,7 @@ void Dup_ListSimilarUsrs (void)
    extern const char *Txt_Informants;
    extern const char *Txt_Similar_users;
    extern const char *Txt_No_users_found[Rol_NUM_ROLES];
+   struct UsrData UsrDatFromForm;
    struct UsrData UsrDat;
    char Query[256];
    MYSQL_RES *mysql_res;
@@ -244,7 +247,7 @@ void Dup_ListSimilarUsrs (void)
    unsigned NumUsr;
 
    /***** Get user's code *****/
-   Usr_GetParamOtherUsrCodEncrypted (&UsrDat);
+   Usr_GetParamOtherUsrCodEncrypted (&UsrDatFromForm);
 
    /***** Start frame with list of possible duplicate users *****/
    Lay_StartRoundFrame (NULL,Txt_Possibly_duplicate_users,NULL);
@@ -253,7 +256,7 @@ void Dup_ListSimilarUsrs (void)
    sprintf (Query,"SELECT DISTINCT UsrCod FROM usr_IDs"
                   " WHERE usr_IDs.UsrID IN"
                   " (SELECT UsrID FROM usr_IDs WHERE UsrCod='%ld')",
-            UsrDat.UsrCod);
+            UsrDatFromForm.UsrCod);
    NumUsrs = (unsigned) DB_QuerySELECT (Query,&mysql_res,"can not get similar users");
 
    /***** List possible duplicated users *****/
@@ -317,18 +320,21 @@ void Dup_ListSimilarUsrs (void)
 		     Usr_NUM_MAIN_FIELDS_DATA_USR-2,
 		     Gbl.RowEvenOdd);
 
-	    // TODO: Show the following button only if this user is in list of duplicates
-	    Act_FormStart (ActLstSimUsr);	// TODO: Change to a new action
-            Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
-	    Lay_PutConfirmButtonInline ("No es duplicado");	// TODO: Need translation!!!
-	    Act_FormEnd ();
-
 	    /* Button to remove this user */
 	    Act_FormStart (ActLstSimUsr);	// TODO: Change to action to request confirmation to remove
             Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
 	    Lay_PutRemoveButtonInline ("Eliminar usuario");		// TODO: Need translation!!!
 	    Act_FormEnd ();
 
+	    /* Button to remove from list of possible duplicate users */
+	    if (Usr_CheckIfUsrIsDup (UsrDat.UsrCod))
+	      {
+	       Act_FormStart (ActLstSimUsr);	// TODO: Change to a new action
+	       Usr_PutParamUsrCodEncrypted (UsrDat.EncryptedUsrCod);
+	       Lay_PutConfirmButtonInline ("No es duplicado");	// TODO: Need translation!!!
+	       Act_FormEnd ();
+	      }
+
 	    fprintf (Gbl.F.Out,"</td>"
 			       "</tr>");
 
@@ -349,6 +355,19 @@ void Dup_ListSimilarUsrs (void)
    Lay_EndRoundFrame ();
   }
 
+/*****************************************************************************/
+/********** Check if a user is in list of possible duplicate users ***********/
+/*****************************************************************************/
+
+static bool Usr_CheckIfUsrIsDup (long UsrCod)
+  {
+   char Query[128];
+
+   sprintf (Query,"SELECT COUNT(*) FROM usr_duplicated WHERE UsrCod='%ld'",
+	    UsrCod);
+   return (DB_QueryCOUNT (Query,"can not if user is in list of possible duplicate users") != 0);
+  }
+
 /*****************************************************************************/
 /********************* Remove a request for enrollment ***********************/
 /*****************************************************************************/