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diff --git a/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor/completion/SCLEditorTextHover.java b/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor/completion/SCLEditorTextHover.java
new file mode 100644
index 000000000..4b57defa7
--- /dev/null
+++ b/bundles/org.simantics.scl.ui/src/org/simantics/scl/ui/editor/completion/SCLEditorTextHover.java
@@ -0,0 +1,107 @@
+package org.simantics.scl.ui.editor.completion;
+
+import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
+import org.eclipse.jface.text.BadLocationException;
+import org.eclipse.jface.text.DefaultInformationControl;
+import org.eclipse.jface.text.IDocument;
+import org.eclipse.jface.text.IInformationControl;
+import org.eclipse.jface.text.IInformationControlCreator;
+import org.eclipse.jface.text.IRegion;
+import org.eclipse.jface.text.ITextHover;
+import org.eclipse.jface.text.ITextHoverExtension;
+import org.eclipse.jface.text.ITextHoverExtension2;
+import org.eclipse.jface.text.ITextViewer;
+import org.eclipse.jface.text.Region;
+import org.eclipse.jface.text.source.ISourceViewer;
+import org.eclipse.swt.widgets.Shell;
+
+public class SCLEditorTextHover implements ITextHover, ITextHoverExtension, ITextHoverExtension2 {
+
+    private SCLTextEditorEnvironment sclTextEditorEnvironment;
+    
+    public SCLEditorTextHover(ISourceViewer sourceViewer, SCLTextEditorEnvironment sclTextEditorEnvironment) {
+        this.sclTextEditorEnvironment = sclTextEditorEnvironment;
+    }
+
+    @Override
+    public String getHoverInfo(ITextViewer textViewer, IRegion hoverRegion) {
+        return null;
+    }
+
+    @Override
+    public IRegion getHoverRegion(ITextViewer textViewer, int offset) {
+        return findWord(textViewer.getDocument(), offset);
+    }
+    
+    private static IRegion findWord(IDocument document, int offset) {
+        int start= -2;
+        int end= -1;
+
+        try {
+
+            int pos= offset;
+            char c;
+
+            while (pos >= 0) {
+                c= document.getChar(pos);
+                if (!Character.isUnicodeIdentifierPart(c))
+                    break;
+                --pos;
+            }
+
+            start= pos;
+
+            pos= offset;
+            int length= document.getLength();
+
+            while (pos < length) {
+                c= document.getChar(pos);
+                if (!Character.isUnicodeIdentifierPart(c))
+                    break;
+                ++pos;
+            }
+
+            end= pos;
+
+        } catch (BadLocationException x) {
+        }
+
+        if (start >= -1 && end > -1) {
+            if (start == offset && end == offset)
+                return new Region(offset, 0);
+            else if (start == offset)
+                return new Region(start, end - start);
+            else
+                return new Region(start + 1, end - start - 1);
+        }
+
+        return null;
+    }
+
+    @Override
+    public Object getHoverInfo2(ITextViewer textViewer, IRegion hoverRegion) {
+        String info = null;
+        try {
+            IDocument document = textViewer.getDocument();
+            String text = document.get(hoverRegion.getOffset(), hoverRegion.getLength());
+            sclTextEditorEnvironment.updateEnvironment(document);
+            info = sclTextEditorEnvironment.getHoverInfo(text);
+        } catch (BadLocationException e) {
+            
+        }
+        return info;
+    }
+
+    @Override
+    public IInformationControlCreator getHoverControlCreator() {
+        AbstractReusableInformationControlCreator creator = new AbstractReusableInformationControlCreator() {
+            
+            @Override
+            protected IInformationControl doCreateInformationControl(Shell parent) {
+                return new DefaultInformationControl(parent);
+            }
+        };
+        return creator;
+    }
+
+}