diff --git a/llvm/docs/Lexicon.rst b/llvm/docs/Lexicon.rst
--- a/llvm/docs/Lexicon.rst
+++ b/llvm/docs/Lexicon.rst
@@ -92,6 +92,16 @@
 **DSE**
     Dead Store Elimination
 
+E
+-
+
+**ento**
+    The namespace containing the parts of the
+    `static analyzer <https://clang.llvm.org/docs/ClangStaticAnalyzer.html>`_.
+    It abbreviates to `entomology <https://en.m.wikipedia.org/wiki/Entomology>`_.
+
+      *"Entomology is the scientific study of insects."*
+
 F
 -