diff --git a/templates/en/about.html.ep b/templates/en/about.html.ep
index 20c0ecc..039c427 100644
--- a/templates/en/about.html.ep
+++ b/templates/en/about.html.ep
@@ -9,6 +9,33 @@
     The models used here are based on an extension of word2vec (Mikolov et al. 2013), wang2vec (Ling et al. 2015) 
     and on the other hand on simple co-occurence counts and analysis methods that operate on these.
 </p>
+<h3>Queries</h3>
+<p>
+    Several word forms separated by blanks are added into one query vector, i.e. the search is
+    around the centre of the alternatives, while a &ldquo;|&rdquo; separates several independent
+    searches. Beyond that, &ldquo;+&rdquo; and &ldquo;-&rdquo; do arithmetic in the vector space:
+    <span class="mono">König - Mann + Frau</span> searches the neighbours of the position
+    vec(König) - vec(Mann) + vec(Frau) rather than the position of a single word. A sign is an
+    operator only at the beginning of a token, so hyphenated words such as
+    <span class="mono">Nord-Süd-Dialog</span> remain searchable.
+</p>
+<p>
+    The syntagmatic view follows along. The predictive score of a candidate is
+    \(\sigma(q \cdot u)\), which is linear in \(q\) before the sigmoid, so an expression
+    yields the contexts that the computed position predicts &ndash; for &ldquo;König - Mann +
+    Frau&rdquo; the ones König and Frau predict but Mann does not. The positive terms are
+    averaged rather than summed, so that the values stay in the range a single word form
+    occupies: the sigmoid is informative over a narrow range only, and the strongest collocates
+    of a single word already sit at the top of it. A balanced analogy (+1 -1 +1) is one term and
+    is therefore on the same scale as a single word form.
+</p>
+<p>
+    The count based collocators, in contrast, remain restricted to a single word form: they are
+    looked up per node in the co-occurrence database and cannot be computed from the query
+    vector. Operands that are not in the vocabulary are named above the result and left out of
+    the computation.
+</p>
+
 <h3>Effective window size and auto focus</h3>
 <p>
     The association measures LL, MI, MI², MI³ and nPMI are not computed over the whole context
@@ -40,6 +67,11 @@
 </p>
 <h3>Changes</h3>
 <p>
+    <strong>2026-09-06</strong>
+
+        The search field understands vector arithmetic, see <em>Queries</em> above.
+</p>
+<p>
     <strong>2026-09-04</strong>
 
         Log-Dice (LD) is now computed exactly as defined by Rychlý (2008),