diff --git a/btreeidx.cc b/btreeidx.cc
index e0761c10..3667abe1 100644
--- a/btreeidx.cc
+++ b/btreeidx.cc
@@ -1313,12 +1313,12 @@ void BtreeIndex::findSingleNodeHeadwords( uint32_t offsets,
 
   vector< char > extLeaf;
 
-       // A node
+  // A node
   readNode( currentNodeOffset, extLeaf );
-  leaf = &extLeaf.front();
+  leaf    = &extLeaf.front();
   leafEnd = leaf + extLeaf.size();
 
-       // A leaf
+  // A leaf
   chainPtr = leaf + sizeof( uint32_t );
 
   for( ;; )
diff --git a/config.cc b/config.cc
index e028ad90..cf226dbc 100644
--- a/config.cc
+++ b/config.cc
@@ -184,8 +184,8 @@ InputPhrase Preferences::sanitizeInputPhrase( QString const & inputPhrase ) cons
 
   if( limitInputPhraseLength && inputPhrase.size() > inputPhraseLengthLimit )
   {
-    gdWarning( "Ignoring an input phrase %d symbols long. The configured maximum input phrase length is %d symbols.",
-               inputPhrase.size(), inputPhraseLengthLimit );
+    gdDebug( "Ignoring an input phrase %d symbols long. The configured maximum input phrase length is %d symbols.",
+             inputPhrase.size(), inputPhraseLengthLimit );
     return result;
   }
 
diff --git a/dsl_details.cc b/dsl_details.cc
index 965ce1c6..569a2d55 100644
--- a/dsl_details.cc
+++ b/dsl_details.cc
@@ -12,6 +12,7 @@
 
 #include <stdio.h>
 #include <wctype.h>
+
 #include <algorithm>
 
 namespace Dsl {
@@ -164,12 +165,37 @@ wstring ArticleDom::Node::renderAsText( bool stripTrsTag ) const
   return result;
 }
 
-// Returns true if src == 'm' and dest is 'mX', where X is a digit
-static inline bool checkM( wstring const & dest, wstring const & src )
+namespace {
+
+/// @return true if @p tagName equals "mN" where N is a digit
+bool is_mN( wstring const & tagName )
 {
-  return ( src ==  U"m"  && dest.size() == 2 && dest[ 0 ] == L'm' && iswdigit( dest[ 1 ] ) );
+  return tagName.size() == 2 && tagName[ 0 ] == U'm' && iswdigit( tagName[ 1 ] );
 }
 
+bool isAnyM( wstring const & tagName )
+{
+  return tagName ==  U"m"  || is_mN( tagName );
+}
+
+bool checkM( wstring const & dest, wstring const & src )
+{
+  return src == U"m" && is_mN( dest );
+}
+
+/// Closing the [mN] tags is optional. Quote from https://documentation.help/ABBYY-Lingvo8/paragraph_form.htm:
+/// Any paragraph from this tag until the end of card or until system meets an «[/m]» (margin shift toggle off) tag
+struct MustTagBeClosed
+{
+  bool operator()( ArticleDom::Node const * tag ) const
+  {
+    Q_ASSERT( tag->isTag );
+    return !isAnyM( tag->tagName );
+  }
+};
+
+} // unnamed namespace
+
 ArticleDom::ArticleDom( wstring const & str, string const & dictName,
                         wstring const & headword_):
   root( Node::Tag(), wstring(), wstring() ), stringPos( str.c_str() ),
@@ -375,7 +401,7 @@ ArticleDom::ArticleDom( wstring const & str, string const & dictName,
 
         if ( !isClosing )
         {
-          if( name ==  U"m"  || ( name.size() == 2 && name[ 0 ] == L'm' && iswdigit( name[ 1 ] ) ) )
+          if( isAnyM( name ) )
           {
             // Opening an 'mX' or 'm' tag closes any previous 'm' tag
             closeTag(  U"m" , stack, false );
@@ -630,7 +656,24 @@ ArticleDom::ArticleDom( wstring const & str, string const & dictName,
 
   if ( stack.size() )
   {
-    GD_FDPRINTF( stderr, "Warning: %u tags were unclosed.\n", (unsigned) stack.size() );
+    list< Node * >::iterator it = std::find_if( stack.begin(), stack.end(), MustTagBeClosed() );
+    if( it == stack.end() )
+      return; // no unclosed tags that must be closed => nothing to warn about
+    QByteArray const firstTagName = gd::toQString( ( *it )->tagName ).toUtf8();
+    ++it;
+    unsigned const unclosedTagCount = 1 + std::count_if( it, stack.end(), MustTagBeClosed() );
+
+    if( dictName.empty() )
+    {
+      gdWarning( "Warning: %u tag(s) were unclosed, first tag name \"%s\".\n",
+                 unclosedTagCount, firstTagName.constData() );
+    }
+    else
+    {
+      gdWarning( "Warning: %u tag(s) were unclosed in \"%s\", article \"%s\", first tag name \"%s\".\n",
+                 unclosedTagCount, dictName.c_str(), gd::toQString( headword ).toUtf8().constData(),
+                 firstTagName.constData() );
+    }
   }
 }
 
@@ -640,7 +683,7 @@ void ArticleDom::openTag( wstring const & name,
 {
   list< Node > nodesToReopen;
 
-  if( name ==  U"m"  || checkM( name,  U"m"  ) )
+  if( isAnyM( name ) )
   {
     // All tags above [m] tag will be closed and reopened after
     // to avoid break this tag by closing some other tag.