diff --git a/doc/index.docbook b/doc/index.docbook
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -25,11 +25,13 @@
 <!ENTITY krusader 'Krusader'>
 <!ENTITY kapp "&krusader;">
 <!ENTITY kappname "&krusader;">
+
+<!-- In order to build Krusader using Ubuntu 18.04 LTS, related ones like Kubuntu, and in docs.kde.org -->
 <!ENTITY NFS   "<acronym>NFS</acronym>">
 <!ENTITY USB   "<acronym>USB</acronym>">
 <!ENTITY Samba "<application>Samba</application>">
 
-<!-- For the 16.04 LTS version of Ubuntu (or Kubuntu, etc.) -->
+<!-- In order to build Krusader using Ubuntu 16.04 LTS and related ones like Kubuntu, etc. -->
 <!ENTITY Left "<keycap>Left</keycap>">
 <!ENTITY Right "<keycap>Right</keycap>">
 <!ENTITY Up "<keycap>Up</keycap>">
diff --git a/krusader/FileSystem/fileitem.h b/krusader/FileSystem/fileitem.h
--- a/krusader/FileSystem/fileitem.h
+++ b/krusader/FileSystem/fileitem.h
@@ -153,7 +153,7 @@
     QString m_group;            //< file group name
 
     bool m_isLink;              //< true if the file is a symlink
-    QString m_linkDest;         //< if it's a sym link - its destination
+    QString m_linkDest;         //< if it's a symlink - its destination
     bool m_isBrokenLink;        //< true if the link destination does not exist
 
     QString m_permissions;      //< file permissions string
diff --git a/krusader/Panel/panelfunc.cpp b/krusader/Panel/panelfunc.cpp
--- a/krusader/Panel/panelfunc.cpp
+++ b/krusader/Panel/panelfunc.cpp
@@ -506,8 +506,9 @@
     // ask the user for the filename to edit
     const QUrl filePath = KChooseDir::getFile(i18n("Enter the filename to edit:"),
                                        QUrl(panel->getCurrentName()), panel->virtualPath());
-    if(filePath.isEmpty())
-        return ;   // the user canceled
+    if (filePath.isEmpty()) {
+        return;   // the user canceled
+    }
 
     if (filePath.isLocalFile()) {
         // if the file exists, edit it instead of creating a new one
@@ -561,7 +562,7 @@
     }
 
     if (statJob->statResult().isDir()) {
-        KMessageBox::error(nullptr, i18n("You cannot edit a folder"));
+        KMessageBox::sorry(nullptr, i18n("You cannot edit a folder"));
         return;
     }
 
diff --git a/krusader/krglobal.cpp b/krusader/krglobal.cpp
--- a/krusader/krglobal.cpp
+++ b/krusader/krglobal.cpp
@@ -32,7 +32,7 @@
 KConfig *KrGlobal::config = nullptr;
 KMountMan *KrGlobal::mountMan = nullptr;
 KrBookmarkHandler *KrGlobal::bookman = nullptr;
-KRslots* KrGlobal::slot = nullptr;
+KRslots *KrGlobal::slot = nullptr;
 KrusaderView *KrGlobal::mainView = nullptr;
 QWidget *KrGlobal::mainWindow = nullptr;
 UserAction *KrGlobal::userAction = nullptr;
diff --git a/krusader/krslots.cpp b/krusader/krslots.cpp
--- a/krusader/krslots.cpp
+++ b/krusader/krslots.cpp
@@ -225,8 +225,9 @@
         } else tmp1 = url1.path();
         if (!url2.isLocalFile()) {
             if (!downloadToTemp(url2, tmp2)) {
-                if (tmp1 != url1.path())
+                if (tmp1 != url1.path()) {
                     QFile::remove(tmp1);
+                }
                 return;
             }
         } else tmp2 = url2.path();
@@ -236,8 +237,9 @@
                                  tmp2 != url2.path() ? tmp2 : QString());
     *p << diffProg << tmp1 << tmp2;
     p->start();
-    if (!p->waitForStarted())
+    if (!p->waitForStarted()) {
         KMessageBox::error(nullptr, i18n("Error executing %1.", diffProg));
+    }
 }
 
 // GUI toggle slots