diff --git a/doc/coding-style.txt b/doc/coding-style.txt
index ede1aca8..4661f063 100644
--- a/doc/coding-style.txt
+++ b/doc/coding-style.txt
@@ -25,6 +25,7 @@ The following style rules apply to C/C++/AspectC++ code:
     * Constant variables: uppercase
     * (no convention for local variables)
     * typedefs: lowercase, underscores (good_name_t)
+    * abbreviations (even in identifiers): uppercase
 
  - Comments:
     * Doxygen comments: