diff --git a/nw/gui/dochighlight.py b/nw/gui/dochighlight.py
index d743caa7..23902db1 100644
--- a/nw/gui/dochighlight.py
+++ b/nw/gui/dochighlight.py
@@ -198,7 +198,7 @@ class GuiDocHighlighter(QSyntaxHighlighter):
         # Build a QRegExp for spell checker
         # Include additional characters that the highlighter should
         # consider to be word separators
-        wordSep  = r"_\+"
+        wordSep  = r"_\+/"
         wordSep += nwUnicode.U_ENDASH
         wordSep += nwUnicode.U_EMDASH
         self.spellRx = QRegularExpression(r"\b[^\s"+wordSep+r"]+\b")