diff --git a/etc/sphinx.conf.in b/etc/sphinx.conf.in
index e9deafe2..a7717ba3 100644
--- a/etc/sphinx.conf.in
+++ b/etc/sphinx.conf.in
@@ -84,7 +84,7 @@ index main1
 	path			= LOCALSTATEDIR/piler/sphinx/main1
 	docinfo			= extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -96,7 +96,7 @@ index main2
         path                    = LOCALSTATEDIR/piler/sphinx/main2
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -108,7 +108,7 @@ index main3
         path                    = LOCALSTATEDIR/piler/sphinx/main3
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -120,7 +120,7 @@ index main4
         path                    = LOCALSTATEDIR/piler/sphinx/main4
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -132,7 +132,7 @@ index dailydelta1
         path                    = LOCALSTATEDIR/piler/sphinx/dailydelta1
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -144,7 +144,7 @@ index delta1
         path                    = LOCALSTATEDIR/piler/sphinx/delta1
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -157,7 +157,7 @@ index tag1
         path                    = LOCALSTATEDIR/piler/sphinx/tag1
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
@@ -170,7 +170,7 @@ index note1
         path                    = LOCALSTATEDIR/piler/sphinx/note1
         docinfo                 = extern
 	dict			= keywords
-        min_prefix_len          = 6
+        min_prefix_len          = 5
         min_word_len            = 1
         #ngram_len               = 1
         #ngram_chars             = U+3000..U+2FA1F
diff --git a/webui/config.php b/webui/config.php
index 31be2ec5..7174baf3 100644
--- a/webui/config.php
+++ b/webui/config.php
@@ -230,6 +230,8 @@ $config['MAX_AUDIT_HITS'] = 1000;
 
 $config['MIN_PASSWORD_LENGTH'] = 6;
 
+$config['MIN_PREFIX_LEN'] = 5;
+
 $config['CGI_INPUT_FIELD_WIDTH'] = 50;
 $config['CGI_INPUT_FIELD_HEIGHT'] = 7;
 
diff --git a/webui/language/de/messages.php b/webui/language/de/messages.php
index 2cd38767..5db02193 100644
--- a/webui/language/de/messages.php
+++ b/webui/language/de/messages.php
@@ -102,7 +102,7 @@ $_['text_email_addresses'] = "E-Mail-Adressen";
 $_['text_email_aliases'] = "E-Mail-Aliase";
 $_['text_email_in_unknown_domain'] = "Die Domäne dieser E-Mail-Adresse ist unbekannt";
 $_['text_empty_search_criteria'] = "'Leeres Kriterium'";
-$_['text_empty_search_result'] = "Keine Suchergebnisse. Versuchen Sie es mit dem Jokerzeichen (*) nach einem Wortteil, zum Beispiel Dupli* um \"Duplikate\", \"dupliziert\" usw. anzuzeigen";
+$_['text_empty_search_result'] = "Keine Suchergebnisse. Versuchen Sie es mit dem Jokerzeichen (*) nach einem Wortteil (min. " . MIN_PREFIX_LEN . " characters), zum Beispiel Dupli* um \"Duplikate\", \"dupliziert\" usw. anzuzeigen";
 $_['text_enable'] = "Aktivieren";
 $_['text_enabled'] = "aktiviert";
 $_['text_enter_one_email_address_per_line'] = "Eine E-Mail-Adresse pro Zeile eingeben";
diff --git a/webui/language/en/messages.php b/webui/language/en/messages.php
index 74ff2ce5..c1e5d889 100644
--- a/webui/language/en/messages.php
+++ b/webui/language/en/messages.php
@@ -110,7 +110,7 @@ $_['text_email_addresses'] = "Email addresses";
 $_['text_email_aliases'] = "Email aliases";
 $_['text_email_in_unknown_domain'] = "Email address is in an unknown domain";
 $_['text_empty_search_criteria'] = "'Empty criteria'";
-$_['text_empty_search_result'] = "Empty search result. Try adding the wildcard character(*) after a word snippet, eg. duplic* to find \"duplicate\", \"duplicated\", etc.";
+$_['text_empty_search_result'] = "Empty search result. Try adding the wildcard character(*) after a word snippet (min. " . MIN_PREFIX_LEN . " characters), eg. duplic* to find \"duplicate\", \"duplicated\", etc.";
 $_['text_enable'] = "Enable";
 $_['text_enabled'] = "enabled";
 $_['text_enter_google_authenticator_code'] = "Enter Google Authenticator code";
diff --git a/webui/language/es/messages.php b/webui/language/es/messages.php
index 202d3a5e..2f919d09 100644
--- a/webui/language/es/messages.php
+++ b/webui/language/es/messages.php
@@ -102,7 +102,7 @@ $_['text_email_addresses'] = "Direcciones de email";
 $_['text_email_aliases'] = "Aliases de email";
 $_['text_email_in_unknown_domain'] = "La dirección de email es de dominio desconocido";
 $_['text_empty_search_criteria'] = "'Criterio vacío'";
-$_['text_empty_search_result'] = "Resultado de búsqueda vacío. Trate utilizar el caracter de wildcard (*) luego de una semi-palabra, eg. duplic* para encontrar \"duplicar\", \"duplicado\", etc.";
+$_['text_empty_search_result'] = "Resultado de búsqueda vacío. Trate utilizar el caracter de wildcard (*) luego de una semi-palabra (min. " . MIN_PREFIX_LEN . " characters), eg. duplic* para encontrar \"duplicar\", \"duplicado\", etc.";
 $_['text_enable'] = "Habilitar";
 $_['text_enabled'] = "habilitado";
 $_['text_enter_one_email_address_per_line'] = "Ingrese una dirección de email por línea";
diff --git a/webui/language/fr/messages.php b/webui/language/fr/messages.php
index 793b551b..fb8ad187 100644
--- a/webui/language/fr/messages.php
+++ b/webui/language/fr/messages.php
@@ -109,7 +109,7 @@ $_['text_email_addresses'] = "Adresses email";
 $_['text_email_aliases'] = "Alias email";
 $_['text_email_in_unknown_domain'] = "L'adresse email fait partie d'un domaine inconnu";
 $_['text_empty_search_criteria'] = "'Critères vides'";
-$_['text_empty_search_result'] = "Résultat de recherche vide. Tentez d'ajouter le caractère joker (*) après un début de mot, ex. duplic* pour trouver \"duplicata\", \"duplication\", etc";
+$_['text_empty_search_result'] = "Résultat de recherche vide. Tentez d'ajouter le caractère joker (*) après un début de mot (min. " . MIN_PREFIX_LEN . " characters), ex. duplic* pour trouver \"duplicata\", \"duplication\", etc";
 $_['text_enable'] = "Activer";
 $_['text_enabled'] = "activé";
 $_['text_enter_google_authenticator_code'] = "Entez votre code d'authentification Google";
diff --git a/webui/language/hu/messages.iso-8859-2.php b/webui/language/hu/messages.iso-8859-2.php
index 55be1ecd..f1edde00 100644
--- a/webui/language/hu/messages.iso-8859-2.php
+++ b/webui/language/hu/messages.iso-8859-2.php
@@ -110,7 +110,7 @@ $_['text_email_addresses'] = "Email c
 $_['text_email_aliases'] = "Email �lc�mek";
 $_['text_email_in_unknown_domain'] = "Az email c�m ismeretlen domainben van";
 $_['text_empty_search_criteria'] = "'�res felt�tel'";
-$_['text_empty_search_result'] = "Nincs tal�lat a keres�sre. Pr�b�ljon meg csillagot (*) tenni a sz�t�red�k ut�n, pl. titkos*, hogy megtal�lja a \"titkos�t�s\", \"titkos�tott\", stb. szavakat tartalmaz� leveleket.";
+$_['text_empty_search_result'] = "Nincs tal�lat a keres�sre. Pr�b�ljon meg csillagot (*) tenni a sz�t�red�k (min. " . MIN_PREFIX_LEN . " karakter) ut�n, pl. titkos*, hogy megtal�lja a \"titkos�t�s\", \"titkos�tott\", stb. szavakat tartalmaz� leveleket.";
 $_['text_enable'] = "Enged�lyez";
 $_['text_enabled'] = "enged�lyezve";
 $_['text_enter_google_authenticator_code'] = "Adja meg a Google Authenticator k�dot";
diff --git a/webui/language/hu/messages.php b/webui/language/hu/messages.php
index 1a7547b7..36854524 100644
--- a/webui/language/hu/messages.php
+++ b/webui/language/hu/messages.php
@@ -110,7 +110,7 @@ $_['text_email_addresses'] = "Email címek";
 $_['text_email_aliases'] = "Email álcímek";
 $_['text_email_in_unknown_domain'] = "Az email cím ismeretlen domainben van";
 $_['text_empty_search_criteria'] = "'Üres feltétel'";
-$_['text_empty_search_result'] = "Nincs találat a keresésre. Próbáljon meg csillagot (*) tenni a szótöredék után, pl. titkos*, hogy megtalálja a \"titkosítás\", \"titkosított\", stb. szavakat tartalmazó leveleket.";
+$_['text_empty_search_result'] = "Nincs találat a keresésre. Próbáljon meg csillagot (*) tenni a szótöredék (min. " . MIN_PREFIX_LEN . " karakter) után, pl. titkos*, hogy megtalálja a \"titkosítás\", \"titkosított\", stb. szavakat tartalmazó leveleket.";
 $_['text_enable'] = "Engedélyez";
 $_['text_enabled'] = "engedélyezve";
 $_['text_enter_google_authenticator_code'] = "Adja meg a Google Authenticator kódot";
diff --git a/webui/language/pt/messages.php b/webui/language/pt/messages.php
index 08a779ee..2d9c436b 100644
--- a/webui/language/pt/messages.php
+++ b/webui/language/pt/messages.php
@@ -98,7 +98,7 @@ $_['text_email_addresses'] = "E-mails";
 $_['text_email_aliases'] = "E-mail aliases";
 $_['text_email_in_unknown_domain'] = "-Email pertence a um domínio desconhecido";
 $_['text_empty_search_criteria'] = "'Critério vazio'";
-$_['text_empty_search_result'] = "Pesquisa sem resultado. Tente usar o caractere curinga (*) após uma palavra parcial, por exemplo duplic* para encontrar as palavras \"duplicar\", \"duplicado\", \"duplicação\", etc.";
+$_['text_empty_search_result'] = "Pesquisa sem resultado. Tente usar o caractere curinga (*) após uma palavra parcial (min. " . MIN_PREFIX_LEN . " characters), por exemplo duplic* para encontrar as palavras \"duplicar\", \"duplicado\", \"duplicação\", etc.";
 $_['text_enable'] = "Permitir";
 $_['text_enabled'] = "Habilitado";
 $_['text_enter_one_email_address_per_line'] = "Digite um e-mail por linha";
diff --git a/webui/language/ru/messages.php b/webui/language/ru/messages.php
index ad2081c9..0b180e40 100644
--- a/webui/language/ru/messages.php
+++ b/webui/language/ru/messages.php
@@ -109,7 +109,7 @@ $_['text_email_addresses'] = "Email адреса";
 $_['text_email_aliases'] = "Email псевдоним";                                                                                                                                 
 $_['text_email_in_unknown_domain'] = "Email адрес находится в неизвестном домене";                                                                                            
 $_['text_empty_search_criteria'] = "'Пустой критерий'";                                                                                                                       
-$_['text_empty_search_result'] = "Пустой результат поиска. Попробуйте добавить звездочку (*) после части слова, например докуме* для поиска \"документ\", \"документы\", итд."
+$_['text_empty_search_result'] = "Пустой результат поиска. Попробуйте добавить звездочку (*) после части слова (min. " . MIN_PREFIX_LEN . " characters), например докуме* для поиска \"документ\", \"документы\", итд."
 $_['text_enable'] = "активировать";                                                                                                                                           
 $_['text_enabled'] = "активен";                                                                                                                                               
 $_['text_enter_google_authenticator_code'] = "Введите Google Authenticator code";                                                                                             
diff --git a/webui/language/tr/messages.php b/webui/language/tr/messages.php
index 9a0edb39..2ee72469 100644
--- a/webui/language/tr/messages.php
+++ b/webui/language/tr/messages.php
@@ -108,7 +108,7 @@ $_['text_email_addresses'] = "E-posta adresleri";
 $_['text_email_aliases'] = "E-posta takma adları";
 $_['text_email_in_unknown_domain'] = "E-posta adresi bilinmeyen bir alan adında";
 $_['text_empty_search_criteria'] = "'Boş arama kriteri'";
-$_['text_empty_search_result'] = "Arama sonucu döndürülmedi. Bir kelime öbeğinden sonra joker karakter (*) kullanmayı deneyin (örneğin \"kopyalanan\", \"kopyaları\" kelimelerini bulmak için kopy* arayın)";
+$_['text_empty_search_result'] = "Arama sonucu döndürülmedi. Bir kelime öbeğinden sonra joker karakter (*) kullanmayı deneyin (örneğin \"kopyalanan\", \"kopyaları\" kelimelerini bulmak için kopy* arayın, min. " . MIN_PREFIX_LEN . " characters)";
 $_['text_enable'] = "Etkinleştir";
 $_['text_enabled'] = "etkinleştirildi";
 $_['text_enter_google_authenticator_code'] = "Google Yetkilendirme kodunu girin";